I didn't use a pattern. I folded the sheet up so it fit on my large cutting mat and cut the strips about 2 inches wide. I used a very large crochet hook and started with about 5 single crochets. Join in the round and continue making single or double crochet. I kinda went by feel.
I found a pattern on pinterest and you can find it here
This is a good way to use up stashed fabric that you no longer like, isn't in style anymore or know you won't ever get to.