I’ve made 4 designs. I’m not sure that I’ll do anything with them other than choose one for my co-op, but…
Christie’s T-shirt Designs – most have my co-op logo on the front left chest area (except Homeschool Classroom as that is on the front)
Admittedly, I’m no graphic designer and I have simple tastes, but I thought I’d share what your ideas helped me to come up with.