We love a good laugh, but so do the good and crazy people at CafePress. You can make just about any kind product to wear. Even dog clothing. Whatever your inclination, they got the T-shirt, hat or mug for you. Politics, hobbies, smarmy statements about life - all here. Even runners. Click through, and look up various running terms (5K, marathon, etc.).
Let 'em know what you do, and help pay for my races.