T-shirts appears to be the answer. Even better if they come with a natty logo or slogan.
Andy Brice has come up with a wonderful idea of creating some interesting T shirt designs with programming related in-jokes. The profits from the sale of these T-shirts goes to two worthy charities: SightSavers and JairpurFoot. SightSavers is a charity helping to prevent blindness and eyesight problems and Jaipurfoot is a charity helping to provide low cost prosthetics to people in 22 countries.
Head on over to T-Shirts for Programmers to read about Andy’s motivations for the T-shirts. His blog also has lots of interesting articles about the independent software business.
Full disclosure: Andy Brice is a customer of ours. Andy uses Coverage Validator to improve the testing of his popular Table Planning software. Andy has recently written a review of Coverage Validator V3.