Gimp is what I can use to get my art on here! Of course, I stumbled across Gimp 2.7... Which is an unstable work in progress version of gimp. But it's a paint program nonetheless! And it has pressure sensitivity so I can use it fine.

I don't use any fancy tools in photoshop anyway. All I ever used was the paintbrush, smudge, highlight, and occasionally blur tool.

Woot for the poor man's photoshop!