How about selling IETF-branded swag? Membership cards? Other cheap junk that does nothing but take up space, collect dust, and confer bragging rights as having financially supported the IETF? Maybe even something useful, like yet another canvas tote bag, like people keep getting from their local public TV station. B-)
Or something really tacky, like wood & metal plaques of the top page of RFCs you've authored, so those can hang on the wall along with patent and trademark plaques?