hmm... those pinks and purples are usually (but not necessarily) normal maps, basically they are applied on top of a normal texture to make the light reflections and whatnot better, but again these pink-purple textures can also be used as base textures too
also, what AI did you use to make that? i use terrain textures in another (non-roblox) game and finding the right ones can be difficult so something like this would be extremely useful
