here are just a few materials.
There are actually 26 in pack, is all of them on spheres.
one could possibly be improved, but it isnt bad if you blend in another material in some spots.
I have made tessellated materials for drag an drop using use in UE4 using the diffuse, normal, ambient occlusion, and displacement. The roughness is .7 and tessellation multiplier is 1.
Should I make second set of materials using the specular maps or just have them in the textures folder with the unused bump map in case someone wants to use them? I was also considering also making a st with the specular as diffuse and some look kind of neat like that.