I found my old friend Lime Green Highlighting again in Visual Studio today. I've been working with some pretty hairy code and found that Lime Green really helps when finding the end brace of a 4000 line if statement...ho boy.
Tools > Options > Environment > Fonts and Colors > ....
From here you get a dialog with a variety of options for changing colors and fonts (Captain Obvious). I use Brace Highlighting (the one with a background setting) and change the background color to Lime Green. I can really tell where the statement begins and ends with that one! Especially since I have a slightly grey bg to save my eyes.
Here's the weak reference from MSDN