Before I get into talking about custom skins, there are two other OS X video tricks that every mac performer should know.
1) Control-Option-Command-8 This one inverts all of the colors on your display. Some people like the way this makes everything pop out. Others like it just because it’s SO SPOOKY.
With a nice light skin like Frost (seen above), you’ll get a very dark, high contrast display.
2) Control-Option-Command-. (period) and Control-Option-Command-, (comma)
These two are used to increase or decrease contrast. You might not see it at first but hit the period on your keyboard a few more times and it will start to become obvious.
By messing with inverted colors and increased contrast, you can create a setup that will absolutely make your eyes bleed if you have to look at it for too long, but might just save your bacon on a gig…