Folder Marker - Change folder color in two mouse clicks for easy at-a-glance identification.
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Teorex FolderIco - FolderIco allows to change the color of Windows folder in one click!
Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
Dr. Folder - Customize windows folder
Muzei - Muzei is a live wallpaper that gently refreshes your home screen each day with famous works of art.