Sometimes you have to be careful about cancer research logos. I think that pink ribbons are copyrighted by the Susan G Coleman group. I don't remember all the details but I also seem to remember a news article where they sued a group of kids for using "for a cure" in some type of fundraiser. (I apologize for not remembering all of the facts)
alot of groups hold slient auctions and look for donations so that might be another way to donate.