Iceberger - Draw an iceberg and see how it will float
Muzei - Muzei is a live wallpaper that gently refreshes your home screen each day with famous works of art.
Stickman Builder - Free parametric graphic Stickman Builder, creates fascinating stick figures on the fly.
Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
Drawy - Learn to draw, use camera to score your drawings
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads