After making my third baby cot quilt, I also had a few of the quilting squares left over, so I decided to experiment with a diamond pattern (actually just squares used on the diagonal).
Sewing a diagonal pattern needs more squares than a straight rectangle. You can work it out mathematically how many more, if you want to! I found I needed about 15- 30% more, but it all depends on the shape you are making. My original plan was to make a long rectangle, on the diagonal.
The idea was that I would have a lovely long patchwork strip that I could use to make a nice little gathered skirt for a baby girl.This failed, as you will see below, but I ended up with a very nice baby sleeping bag. You can find out how to avoid my mistakes, and make a quilted sleeping bag (or just a sleeping bag) for a baby, below.