If you haven't set yours up yet, do it. It's a VERY cool perk that's gotten very little publicity, but I just finished playing with it a bit to view various skins and it is a FANTASTIC little gimmick neoqb included for our use.
You can see how musicman set up his background in this thread:
http://riseofflight.com/Forum/viewtopic.php?f=49&t=8669&hilit=skin+viewer . I did it as described and only had to navigate through the rof folder after making my background screenshot to actually find it and use it. I found it in my rof/bin_viewer/release folder. Double click and the viewer opens.
What a neat little program.