Comstock Cards

Comstock Cards is a good market for writers who can come up with clever and funny greeting card ideas.  They pay $50 per idea for all rights, and are mainly looking for cards that are either "outrageous" or "sexual."  Submissions can be made by snail mail or email, but if you email them ideas you won't hear back unless they want to buy something.  Response time is one to one and a half months.