Another artist who has successfully brought "real" art to a "virtual" canvas is graffiti and fine artist Dan Witz (http://www.bway.net/~danwitz/). The opening for his most recent works was on Friday, Jan. 16, in a Chelsea galley (and also seen around Williamsburg). There are a plethora of sites about graffiti (including how to remove it), and where you can make your own on the web. It will be interesting to see how this alternative art form finds further expression on the Web.
(Appeared originally in @The Scene in the @NY newsletter)