Bomomo....move the balls of ink around the screen
Viscosity.....slide the paintbrush over the block to create new shapes
Soban programs....you can use any of these programs to make amazing art.
The fantastic Jackson Pollock website..click and drag and then click again!
Make a Mondrian picture in the Mondrimat!
Imagination cubed allows you to draw and then watch your drawing replay itself
Tagalaxy allows you to create word pictures.
Canon's Creative Park has some fantastic paper folding templates ...take a look