John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads

Thankbox - Online group card & gift collection for teams. Like passing a card around the office but without the card.

Muzei - Muzei is a live wallpaper that gently refreshes your home screen each day with famous works of art.

Toon Kids - Toon Kids is an automated platform to create customized birthday animations for children, where the child is the hero of the movie.

Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.

Thankbot - Drive more business with handwritten notes