Cairo Shell - Cairo is a desktop environment for Windows.
bbLean - Alternative Windows shell
bug.n - Provide views (i. e. virtual desktops) for showing only those windows, which you need to do your work..
BB4Win - BB4Win (Blackbox for Windows) is an alternative shell for Microsoft Windows.
SkinPacks Flattastic Theme - SkinPacks Flattastic Theme is a powerful software designed for the windows system that allows users to change the skin of the window without facing any hassle.
Stardock SkinStudio - Stardock SkinStudio is the robust and useful utility that is a reliable chum for WindowBlinds, which can be valuable in creating your own skins for the desktops.