I couldn't really see a section for Launcher themes so I just made one here.
To replace a default theme go to:
pick a folder, drag the image in and rename.
One of my favorite things with the Windows theme modding groups is the looking towards real world textures rather than just gradients and the like.
So I made a menu theme based on that.
Other side of the spectrum. You could make it super simple, metro style.
Had them for a few years now. Just thought I'd share