Cobalt Blue and White Granny Diamond Bed Cover Crochet Pattern

This bed cover takes the humble granny square and turns it into something bold and graphic. Each block is a large granny square worked in cobalt blue and white, with the colors changing round by round to make rings inside rings. When you turn the squares on point and join them, every ring becomes a diamond. The finished cover shows big nested diamonds with thick blue outlines, and along the edges the half diamonds form a row of sharp blue zigzags, like a blue and white tile floor or a piece of classic china.

Every piece is made with the granny stitch, the friendly cluster of three double crochet with a chain between groups. That means there is really only one stitch to learn, and once your hands know it, the whole project flows. The squares are worked in the round from the center, fourteen rounds each. The color plan is simple: two white rounds, one blue, three white, two blue, three white, one blue, one white and a final blue round. Because every square ends with blue, the joins between squares show as a thick blue lattice that frames each diamond.

To make a straight-edged cover out of squares turned on point, you need two kinds of triangles. The setting triangles are half squares, worked in rows from the middle of the long edge outward, and they fill the gaps along the four sides of the bed. The corner triangles are quarter squares, worked in rows from the corner, and they finish the four corners. Both use the same granny stitch and the same color plan as the squares, so the diamonds continue right to the edge of the cover without a break.

Each square measures about 14 inches on each side, which is about 20 inches from point to point when it is turned into a diamond. The queen size is four diamonds across and five diamonds long. It uses 32 squares, 14 setting triangles and 4 corner triangles. The finished cover measures about 79 by 99 inches before the border and about 80 by 100 inches after it, which drapes nicely over the sides and foot of a queen bed.

The pieces are joined with a cobalt blue whipstitch through the back loops, so the seams lie flat and blend into the blue outer rounds. The border is a round of white single crochet and a round of small white shells. I worked out the counts so the shells fall evenly along every side, and the same math works for any number of diamonds, so you can make the cover larger or smaller without changing the border at all.

The pattern uses only chain, slip stitch, single crochet and double crochet. What makes it intermediate is the size of each square, the color changes, which leave quite a few ends to weave in, and the layout on point, which needs a little care when you join. If you have made a granny square before, you already know almost everything you need. The rest is patience and a good place to lay the pieces out.

The finished cover is cozy and substantial, with the slightly bumpy texture that makes granny stitch so comforting. Cobalt blue and white is a timeless pairing that looks crisp and fresh in a cottage bedroom, a coastal guest room or any space with blue and white pottery and natural wood. It feels traditional and modern at the same time, and it makes a striking centerpiece for a room.

I love that this whole bed cover is built from the very first stitch most of us learned. The granny square is like an old friend. Three double crochet, a chain, three more, around and around. I can make granny rounds with my eyes half closed, chatting with my sister on the phone or watching a quiz show in the evening. Yet with nothing more than that friendly stitch and two colors, this cover looks bold and modern, as if it came from a design shop.

The moment I turned my first two squares on point and held them side by side, I was hooked. A granny square with blue stripes is pretty, but a little ordinary. Turn it on its corner and suddenly it is a diamond with rings inside rings, and when you lay four together, the blue rounds cross like a star in the middle. It is such a simple trick, and it changes everything. Every time I lay out a new row, I step back and smile.

I also love how quickly the cover comes together for its size. Because the squares are big, there are only 32 of them, plus the triangles. I made about one square every two or three evenings, and after a few weeks I had a stack that already looked like most of a bed. Compared with a cover made of a hundred small motifs, there are far fewer pieces to join and far less to keep track of.

Here are the habits that kept this project easy for me:

• Weave in the ends after every color change, never at the end.
• Change colors in a different corner each time so the joins do not line up.
• Make all the squares first, then the triangles, so your tension is settled.
• Lay the pieces out on the floor before joining, on point, to check the plan.

The colors make me happy every day. Cobalt blue and white remind me of old china plates, Delft tiles and summer days by the sea. They look clean and bright, and they never go out of style. On our bed, with a blue and white ginger jar on the nightstand and a jute rug on the floor, the whole room suddenly felt pulled together, fresh and welcoming, like a guest room in a seaside house.

I love the triangles too, even though they are a little extra work. They are fun to make because they grow in rows instead of rounds, and you can watch the half diamond appear as you go. When the last corner triangle went in and the edge of the cover turned perfectly straight, it felt like fitting the last piece of a puzzle. That straight edge also makes the scalloped border look neat and finished.

Finally, I love that this pattern feels like an heirloom from the very first day. Granny stitch has been made by grandmothers for generations, and here it gets a fresh, graphic look that younger family members love. I can imagine this cover on a grandchild's bed one day, still bright and still loved. If you make it, I hope it becomes that kind of piece in your family too.

Choose a new color pair. This design shines with any strong contrast. Navy and cream feel classic and nautical, emerald green and white look fresh and bold, and terracotta with sand is warm and earthy. For a softer room, try dusty rose with ivory or sage with oatmeal. Keep the outline color the darker one, because it carries the lattice that frames each diamond, and use the lighter one for the wide inner bands.

Make it for any bed. Each square is about 14 inches, or about 20 inches from point to point, so the cover is planned in whole diamonds. For a layout of A diamonds across and B diamonds down, you need A times B plus (A minus 1) times (B minus 1) squares, 2 times (A minus 1) plus 2 times (B minus 1) setting triangles, and always 4 corner triangles. These sizes are before the border:

• Twin: 3 by 5 diamonds, 23 squares and 12 setting triangles, about 59 by 99 inches
• Full or queen: 4 by 5 diamonds, 32 squares and 14 setting triangles, about 79 by 99 inches
• King: 5 by 5 diamonds, 41 squares and 16 setting triangles, about 99 by 99 inches

The border works for every size, because each side of Border Rnd 1 always has 84 stitches per diamond plus 2.

Make a sofa throw. Two diamonds across and three down uses 8 squares, 6 setting triangles and 4 corners, and gives a throw of about 40 by 59 inches. It is a great way to try the on-point layout and the triangles before a full bed, and it uses only about a quarter of the yarn. Draped over a sofa or a reading chair, the big diamonds look striking even in this small size.

Make a baby blanket. Stop the squares and triangles after Rnd 8 or Row 8, so the squares are about 8 inches. Work Rnd 8 and Row 8 in blue so the outline stays. A layout of 3 by 3 diamonds uses 13 squares, 8 setting triangles and 4 corners, and gives a blanket of about 34 by 34 inches. Use a soft washable cotton blend, and try pale blue and white or mint and cream for a gentle nursery look.

Add matching pillows. One square makes a 14 inch pillow front, or turn it on point and add four corner triangles to make a square cushion of about 20 inches with a diamond in the middle. For a lumbar pillow, join two setting triangles to one square in a row. Back each one with a plain white or blue granny square worked in a single color, and work the shell border around the edges to close the pillow.

Play with the color plan. You can change the order of the rounds to change the look completely. Make every other round blue for thin, busy stripes, or keep only Rnd 3 and Rnd 14 blue for a calmer cover with wide white diamonds and fine outlines. You can also swap the colors on alternate squares, so blue diamonds with white outlines sit next to white diamonds with blue outlines. Sketch your plan on squared paper before you start.

Change the edge. The small white shells are neat and simple. For a bolder frame, work the border in blue, or add a blue round of single crochet between the white rounds for a striped edge. For a vintage feel, add a picot to the top of each shell. Any edge with a 4-stitch repeat will fit the counts exactly, so you can try a few ideas on one side before you commit.

Change the yarn weight. In DK cotton with a 4 mm hook, each 14 round square comes out about 11 inches, and a queen cover needs about 5 by 6 diamonds. In bulky yarn with a 6.5 mm hook, the squares grow to about 18 inches, so a queen needs only 3 by 4 diamonds, which is just 18 squares. Always make one square first, measure it, and plan the layout in whole diamonds before you buy yarn.