Well, I think that it is a pretty busy fabric for an OBW, but I bet it will turn out great!! Cut your strips 3 3/4 inches, which will make a hex that finishes at 6 inches. You can go smaller, and do the 2 1/2 too. The smaller one will isolate the colors better. It's entirely up to you. You can cut a strip of each size and cut the hexs, then decide which you like best. Use the size NOT chosen as border accents, or a pillow or a doll quilt. And good luck, I want to see how it turns out!!