Pay 30 Euros to have a message of your choice spray-painted on the Israel/Palestine wall.

From the FAQs:

Where does the money go?
Part of your money stays in Holland, to cover the (minimal) costs of setting up and running ‘Sendamessage’. The bulk of the money will go to the Palestinian NGO’s (independent foundations) doing the work. They will fund small social, cultural and educational projects with the money earned (from buying bicycles to fixing the roof)

Yikes, not really sure what to say about this one. Even if the money really does go to a “good cause,” this project still makes my stomach turn.