thank you
Under Mango it will install under Settings (both apps).
there is no straight forward way to uninstall the newly installed apps from the settings page. I successfully uninstalled with XAPDeployX. Sideload the xap again and check "force uninstall if application is already installed". Then click deploy. The program will uninstall the existing one on the device first and report this in the deploy tool with a success message. Right then you unplug the phone from the USB. Voila - it is now uninstalled and gone from settings.
Somebody else posted that you can install an older version (e.g. v1.3) that will show up in apps. Then you uninstall and it normally and it will be removed from settings as well.
just in case it doesn't work for you and you want to remove it...
thanks
edit1: Cool, I can confirm that adding new themes works fine now on LG Quantum. With v1.3 only an existing one could be changed (there is a little bug that it multipies the colors within the program when you go back and forth, but luckily it doesn't stick in settings). When the app first opens I get an "UnauthorizedAccessException" message, but it continues to run.