Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
As the development of appindicator getting more mature, more and more apps started to show up with support for the indicator-applets. Since most of these apps are not found in the Ubuntu repository, we have compiled a list of useful appindicators that you can install and use.
DesktopNova is a Gnome and XFCE based wallpaper changer. Indicator-desktopnova is an apppindicator developed by another developer, Michael Otto to allow you to change wallpaper directly from the system tray. If you are looking for a simple wallpaper changer, this will be useful.