I was emailed recently about an awesome website called Revenge of Sirius.  It was started by a group of fans who wanted to use their fan status for good.  They sell fan art posters and the proceeds go to Autism Speaks.

“In celebration of the final 2 installments of the Harry Potter movie series and as a project of fan appreciation, 7 top designers and artists, who are also fans of the series, were commissioned to create original artwork celebrating one of the series’ most memorable, and unforgettable, moments. This ultimate “fan art” was then turned custom, individually numbered poster.  The posters are limited to an edition of just 300, with less than 250 available to the public through our website. Each beautiful poster tells its own different story, allowing the fan to relive memorable and influential moments in an artistic manner. Once this limited edition print has sold out, they will never be printed again. We will be releasing these posters in two week intervals, starting in july. Celebrate the fandom, the story and the thrill of Harry Potter by hanging a little part of its history, inspiration and influence on your wall.”