Shouldn't there just be an OUTHOUSE cushion, not an outdoor chair or stadium one? Do you really think people are going to choose a cushion in advance to match the occasion? Are you claiming that these will become so popular that they will be like choosing a jacket or pair of shoes before leaving home?

If you are going to make special occasion cushions, I'd suggest these:

(l) The Mother-of-the-bride Cushion: surrounded by flowers and tinted like the bridesmaids dresses. That way when the groom's family wants to know which is the mother of the bride, the bride can point and say, "The one sitting on the fart cushion"--that also allows the groom to know that the problem may run in the family

(2) The college graduation cushion: black (or other school color) with turd-shaped tassels. When the class valedictorian gives his/her speech, s/he can mention that s/he "blew her classmates away and they didn't even know".

(3) The doctor's office cushion. This one could have a special pouch for collecting and/or transporting a stool specimen.

(4) The practical jokester's cushion: An inert lookalike that enables the jokester to pleasantly surprise any person sitting next to him/her. The jokester can laugh as the others gag and run away, confused over why the smell is so bad when the jokester is sitting on a cushion.