Oh! I have just the little nifty GIMP file for this! Unfortunately, I do not have the link to the original download, and some of the layers are a little mixed around because I had to recover it from a version on another computer I already saved over, but it's still really helpful! It's how I make my presets! If you do have a Gmail, I can share the file with you over drive!
EDIT: I decided I should cover more about what's actually in it XD
So it's got the UV Guidelines, a humongous verity of textures, including premade eyes, tongues, noses, and mane and wing textures. It makes preset making so much easier. You dont' even have to make a new canvas for other parts, because you can hide the color layers provided, and start coloring on a new one, changing the UV map and textures to match different body parts! It's really cool. I'll probably go through the layers today and make sure everything is where it's supposed to be. So I'll have it later today!