You know, I've always wonder what you see with colorblindness. I know you can't see a certain color, but what do you see as a result? Is it a certain shade of grey or do you see the another color? I'd love to know what it looks like. Can you explain it because apparently you see all the other colors. I may not have a color blindness, but I do have Usher's syndrome, which causes my sights and hearings to be decreased (luckily it would be type 2). Problem is, I'm more serious about music (funny, I'm only starting guitar) than art, but I know I am capable of doing art as well. I also have a partial night blindness.
But hey if you don't own your problems, then your problems own you. Like the article lovingthedark put, show someone who can't see any color say "screw that! I'm going to be an artist anyways!" (not a real quote). :)