Windows has already established support for themes, also called visual styles, since Windows XP. By default, Home windows will only fill Microsoft-signed styles - but you can get around this pretty easily.
There’s a thriving community of theme-builders who are creating themes for Home windows 7 and 8 still. These aren’t your standard Windows styles - they modify the looks of window name bars, buttons, and other visual elements.
Home windows investigations if windows 7 desktop gadgets are signed by Microsoft before loading them. If indeed they aren’t, Windows won’t fill