A quote from their site:
Alchemy is an open drawing project aimed at exploring how we can sketch, draw, and create on computers in new ways. Alchemy isn’t software for creating finished artwork, but rather a sketching environment that focuses on the absolute initial stage of the creation process. Experimental in nature, Alchemy lets you brainstorm visually to explore an expanded range of ideas and possibilities in a serendipitous way.This program enables the artist a variety of interesting ways to generate new ideas. Although a little difficult for me to explain in writing, it basically helps stimulate the mind to think creatively by creating shapes randomly -from which the artist can try to 'see' new ideas. -Kind of like looking at clouds or ink blots, but the cool thing is that I have a certain amount of control to manipulate the shapes in various ways.
Maybe that sounded like gobbly-gook, but visit their site if your interested in learning more. -Or look up some videos of it in action on Youtube. The program is free to use.
It also has a pretty slick painting ability, although I'd recomend laying out the UV's in another program first before using it to paint anything.