What I mean is - Mhen this is going to be weird to explain.
Put it this way I guess: Taking a height map off of the web [the same size] and putting it into Gimp, then saving it as "[name]Terrain.png".
Ex:
VolcanoTerrain.png
Now take that with Presets, the [still 512x512] images from the web into Gimp and saving them as "preset_#head/tail/body/mane/eye.jpg.
Ex:
preset_7head.jpg
Lastly, with Markings. Take the [still 512x512] images from the web and put them into Gimp, then save them as fmark[markingname]head/body/tail.png
Ex:
fmarkCelticHead.png
Maybe I should just go find a thread explaining this if there is one o.o