UIQ Technologies recently launched the UIQ Themes campaign where they are releasing one theme at a time, in a series of five. You can easily determine the looks and sounds of a phone by installing a new theme. A UIQ Theme contains a skin that affects the color and shape of the UI controls, wallpaper and sounds. The themes work in any phone based on UIQ 3 (Sony Ericsson smartphones).
At this point, two UIQ themes (UIQ Azure and Northern Light) are available.