I found a couple of pictures online of crocheted ottoman covers, but there aren’t a whole lot, and less with patterns. In fact, I didn’t find any with a free pattern that was like this. So, I’ve prepared a pattern for your use.

Supplies:
Various colors of yarn (it doesn’t take much, less than 1/2 a skein for an entire ottoman)
3-4 skein of main color (White)
Crochet hook (I used size H/5.0 mm to get the size of square needed)
Yarn needle
Measuring tape (to determine dimensions of ottoman)
An ottoman to cover!