Rebelle: A New Painting App On The Block

For all of $60. There's also a 30 day demo.

Rebelle is a revolutionary one-of-a-kind paint application that lets you create realistic wet and dry media artwork, complete with stunning real-world dynamic simulation of fluid flow, color blending, wet diffusion, and drying. More info: http://rebelle.escapemotions.com Credits: Speed-painting made by artist and teacher Tim Shelbourne.