hahaha a Lindy bobblehead doll would be full of win. I'm not even gonna lie about that.
This idea is on the back burner for now, but I'm always thinking about it. Couple of questions...
White or black shirts? I hate white shirts, personally, because as mentioned, you spill something on it just once and you're screwed.
Selection? My initial thought is coffee mugs, t-shirts, and hoodies. However, this is kinda pedestrian, and really doesn't cater to video games in any way.