This was the base image I used. All I really did was removed the background, converted to grayscale, posturized the image, and smoothed the edges.
I then swapped the black out for some color and made these.
Blue
Red
Purple
I also made this image, but I just don't like how it turned out.
Huh. I don't know if what you're doing is entirely original, I'm not an art critic and I've seen similar things before. However, I really like the results. You should do a few more.
Also, have you tried Gimp? It doesn't have all the tools of photoshop, but you can still do some fun things with it.