I've been a big fan of Rudy Rucker's work for many years, but I only knew of him as a mathematician, computer scientist and novelist.
In fact, I just received his novel, Mathematicians In Love from Amazon, last week ... and it went straight to the top of my pile of unread fiction. I should get to it around September, when I finish The Contortionist's Handbook, which I started over the Bah Humbug break :-).
Today, via Boing Boing, I discovered that he's also an artist! He currently has a small selection (and discussion) of his paintings on his blog at the moment.
More can be found in his gallery at ImageKind.