Many people will just say this is taken from minecraft. It partially is. Now shush.
This idea is to have a new section in the catalog called "Textures". They will change what everything looks like. Like a mid-evil texture, a space texture, etc.
Ah, i get where you're coming from. But with roblox i'm not sure it'd quite fit (In my opinion). I think it's something a scripter/builder could create, but who am i to say.