So, I've done the bit where you take the dds file, open it in GIMP, and change the color and everything. There are two new dds files, skeletonred and skeletonblue. The problem is, I have no idea how to apply these new skins to new creatures I create. I've looked everywhere, and I can't find a way to select and open a dds file and then add it to something.
Halp?

Here ya go: http://www.youtube.com/watch?v=9MYG4IvgKGo

Thanks!