Not from scractch unfortunately. What I did with the one in my sig, was basically change all the like colours one colour, I also cut off the jacket to make it smaller, and added triangles. I was surprised myself, on how well it turned out. Needless to say, perhaps the best guide I can give you, once you've found a descent match, is start for example on the pants. Lets say the pants is 2 colours, red and light red, and you want it to be black, instead of going all black on the pants, choose a dark grey to replace the light red, and black to replace the red. It gets somewhat more complicated with more colours, but it just means you have to pay attention to more combinations. I believe there is a forum for sprite talk though, if you wish to learn more, though I've never visited it.