Folder Marker - Change folder color in two mouse clicks for easy at-a-glance identification.
Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.
Folder Painter - Folder Painter is an easy to use Portable Freeware program, which allows you to change the color of the icon representing a chosen folder to any color you like
Lively Wallpaper - What is it? Lively is a Free and Open-Source Software (FOSS) for animated desktop wallpapers.
Teorex FolderIco - FolderIco allows to change the color of Windows folder in one click!
ScreenPlay - Open-source and cross-platform Wallpaper, Widgets and AppDrawer app.