I found this, and I thought of your drawing skills.
See how it starts out with a black and white outline, and then its filled in? Can you make black and white outlines of your drawings? That way, I can practice my inkscape skillz on them!
Huh, never tried Inkscape. I was able to nab a student copy of Photoshop for a low price, and have been just using that.
What sorts of improvements are you working on within the program? Have you looked much into color theory and balancing of elements to make things easier on the eye, or are you choosing to wing it?