Hi everyone, I recently started to create T-shirt designs on Zazzle (do you know about it?). Below are some of the designs I made. I would really appreciate any feedback you might have and if any of you are doing T-shirt designs I would like to hear your advice. Also if any of you is interested in promoting these, Zazzle gives a 15% referral commission for each sale. Thank you!

You can see more of my designs here:
Cool Geeks
Rude Productions
One Real World