The creatureoverlay.zip file you have requested: Tools and Utilities / Creature Overlays (For Gimp) - 1.02mb is not available. Perhaps try browsing all files for the game Black & White 2 and upload any files you want to share or are missing. This is the only information we could locate:
To use these transparencies with gimp,Open you're texture. It has to be 512x512 pixels, and can be jpg, bmp, dds, but not gif. go to file on the image menu, and select Open as layer. Select the transparency you want to use.If you like the way This is a cool little pack my 1morerun that allows you to make your own skins pretty easily. You do need the Program GImp for it though.