I've looked at a lot of paleo shirts, but none seem quite right for me. The wording on many of those shirts seems kind of combative, as if their purpose is to start an argument. Fine for people who want to have that kind of discussion with strangers, but I don't. I want something low-key, perhaps amusing. I don't want the vegans to come and yell at me while I'm drinking coffee and reading my book. I just want to read my book.
It would be cool if there were some sort of symbol or logo that could help paleo people identify each other. Mark of Mark's Daily Apple is way ahead of the game with that Groko Grok logo of his.
So far the paleo shirt I like best is the one that says "I find your lack of bacon disturbing." Excellent! But I do want a shirt that is for women, and with a neckline that an inch or so below my collarbone, not above. That bacon shirt didn't seem to have the cut I'm after.
Anyway. I'm just adding my comments in case they're useful to any t-shirt designers.