Yeah, well you got Pro Choice in my Prostate Cancer!
Here's a handy chart identifying the causes tied to the colors of those ubiquitous rubber bracelets. Be careful though, Alzheimers, Animal Abuse and Irritable Bowel are all purple so before you buy one, decide on which of the 5-10 causes you're Really supporting.
Oh, and colon cancer? Turns out it's, ah, turns out it's brown.....