Softros LAN messenger - LAN messenger for an internal office chat for home or business users. It does not require a server and is very easy to install and use. It supports personal chats, group chats, message brodcasting, files transfer and remote desktop access.

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

MyChat - Secure instant messenger for any network

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

BORGChat - BORGChat is a LAN messaging software program.

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