the style i noticed most around the city where i'm from are tees with 90s or 80s pop icons with retro colors. A lot of the tees are political statements or verses from popular songs.
Other styles I noticed were tees repping someone's city like this one,
http://www.karmaloop.com/vendor/SEV/...09-30zoom2.jpg
I mean, we don't have too many shops around here in the city but the popular ones are Karmaloop.com, Concepts, and Bodega.
-Golden345