The question hasn't arised until now. Maybe you like the actual look, maybe you don't care or haven't even thought about it :) This forum works on SMF, which lets you change the "visual theme" dinamically, and even let users choose whichever fits their tastes best. The current theme is called DilberMC.
You can have a look at what's currenlty available here: http://custom.simplemachines.org/themes/
If you see anything that catches your eye, we can talk about it :D