They have thousands of free & paid skins.
WinCustomize: Explore : WindowBlinds
After a while I get tired of a skin & try a new free one.
Windows 10 will hopefully offer skins or better tweaking of the GUI.
I have it installed next to my 8.1 copy.
But I can still hop back over to 8.1 and run it in a VM and see.
It'll probably work better when the final version is released.
Stardock is seeing 10 coming & probably has their code writers working overtime upgrading their stuff.
Oh, you can be sure of that!