Make your own Mandala
http://www.girlsgotech.org/mandala.asp

Destination Modern Art
http://www.draw3d.com/

Jackson Pollock
http://www.jacksonpollock.org/

Mondrimat-Mondrian
http://www.stephen.com/mondrimat/index3.html?

Make new hybrid animals that are photorealistic
http://switchzoo.com/

Online Etch a Sketch
http://www.etchy.org/

The Met Museum Interactive
http://www.metmuseum.org/explore/index.asp

You Draw
http://www.youdraw.com/emailpad/emailpad.html

Art Games
http://www.kids.albrightknox.org/

Mr. Picasso Head
http://www.mrpicassohead.com/create.html