I used a single-crochet stitch on most of them . . .
and on some I used a half-double crochet stitch.
I use 100% cotton yarn, in multi-color cuz I like the brightness and variety. The one problem I'm finding is that when I give these away, the folks I give them to think they're pot-holders. I guess they can be used as double-duty.
I think the Goatmother over on Goat Philosophy 101 (Marigold's Mama) has perfected the Granny Square, which is my next feat, I hope. She even does some great "clothing" for her pup Cabra. Much to Cabra's chagrin. I'm not sure my furrbabies would go for clothing, but I have thought of doing little sweaters for them. Now where DID I put that measuring tape . . . more projects to come.