Windows has had support for themes, known as visual styles also, since Windows XP. By default, Windows shall only fill Microsoft-signed themes - but you can bypass this fairly easily.
There’s a thriving community of theme-builders who are still creating themes for Home windows 7 and 8. These aren’t your standard Home windows designs - they adjust the appearance of window title pubs, buttons, and other visible elements.
Windows inspections if windows 7 themes are signed by Microsoft before launching them. If indeed they aren’t, Home windows won’t load them in any way. To