This sounds like something useful! I haven't come across anything like it, although I found a couple of German Creatures sites which have sections about pigment bleeds, rotation, and swap. Do either of the following seem familiar? I'll keep looking if need be: Just wanted to see if I'm on the right track or not!
Creatures Unlimited Pigment Bleeds: In German, but something like Google Translate can easily fix that!
Simonias Creatures Welt Rotation and Swap: In German and also on Wayback Machine, since the site has been down for some time. Nice images of different color rotations and swaps, though!