The model developed so far is called 'centup' and is being developed by the team at http://www.good.is
Centup is a model that allows artists put a centup button on their work and allows fans to put money on their account through paypal. The fans can then give a few cents to artists in support of their work. In the Centup model 50% of the money goes to the artist and 50% goes to supporting an NGO chosen from Centup's list. So artists can earn money and support social change through art."