Screenlets are small applications that you can put on your desktop. They are great eyecandy and you can change their theme, resize and also move them around your desktop. Screenlets are not only for aesthetics but are also functional little applications. You can view your CPU usage, IP address, weather, stocks, clock, search, hard disk and many others. If you are a developer you can create your own screenlets in python. To install screenlets on Ubuntu just go to Applications, Add/Remove and search for the program. Other packages are available on their site. For additional information and nice screenshots check out Screenelts.org.