Free Art Programs! Have fun!

 

Gimp

Is probably the best freeware program on the net. It immitates many of the same features of Photoshop including layers and pressure sensitivity. 

Paint.NET


This program is simillar to MS Paint but with layers.

Inkscape


I hear this program immitates Adobe Illustrator. I haven't used it yet myself, but here is a review from one who has.

Pixia

This program does not support pressure sensitivity, but the tools are simillar to GIMP and it includes a smudge brush which makes it possible to create a shading effect.