Each theme can be classified into certain categories such as games, animes, sport, movies, nature and just about anything you can think of. There are Windows Themes available on this site and it's free to download.
You have the options to customize the themes to your likings and modify the standard interface of your Windows PC. A Windows Theme is a visual pattern that predefines the collection of wallpaper, icons, pointer, screensaver, sounds or any color styles which together form the looks of your PC.