Hey Dave!
Well I´m a T-shirt lover.... ask my mom and she´ll tell u she hates that I don´t wear nice blouses often... just that "ugly t-shirts" (that´s what she says) so I´d buy a T-shirt... the stickers are good idea... if they are to put in the windshield of the car better.
Here are more ideas for merchandice:
Babydolls for women maybe

, Thongs

:P, Tube Tops, Keychains, Pins, Cd Holders.