kman............sorry so long. I've been pretty swamped, lately.

Well, the list length has been worked on before, using a scroll feature, and does just fine..........if you've only got Categories and Sub-Categories. Beyond that, it breaks the flyout.

I think the grays' you're wanting to change can be found in these lines of code in your stylesheet:

Code:
#nav-cat ul.level2 {background-color: #C9C9C9;}
#nav-cat ul.level3 {background-color: #C9C9C9;}
#nav-cat ul.level4 {background-color: #C9C9C9;}
Actually................for a site with as many Categories, Sub-Cats, Sub-sub-Cats, etc.............I wouldn't even recommend using this particular menu, as it DOES take up a LOT of 'real estate' on a site this size.

Personally, I WOULD recommend Glens' Categories Dressing, letting each Sub and Sub-sub-Cat slide DOWN instead of "flying" out. Or...........I'm working on a Mega-Menu............ .....but, I can't discuss that right here, at this time. Further discussion about that will have to be in the form of a pm, email, or contact via my site.

Of course, it's your site, and that's just my opinion about the menu, but I already know you agree on the 'real estate' part, and I'm sure you're customers aren't too thrilled with the current menu....................

Anyway...........I hope this helped SOME, anyway.