Thats a really good idea - being able to edit the actual template would allow me to make very radical changes which would be really neat.
The only thing that makes me hesitate in contacting the admin(s) is that there are
a lot of "designers" on this site, and if the admin(s) let me make a template, eleventy billion other people would want to make one too. Another thing is that with more skins comes more work/responsibility. Any site-wide changes (new ad scripts, etc) would have to be made for one more skin. Three skins isn't overwhelming, but I imagine it is a concern of theirs.
What I think would be a good solution is if the MR team held a template design competition, where the entrants would design a complete VB template and the community would then vote on the best. The best one would either get added to the list, or (better, IMO) become the official default skin.
That way, we'd get some serious competition going and I think the end result would be incredible no matter who won.