Is there a way to invert the colors on the menu bar at the top of the screen, as well as the title bars of all the windows is OS X? I have a lot of Terminals open usually, and the the light menu bar stands in the way of the vibe I want.
You can do this with Obsidian Menu Bar:
Obsidian Menu Bar
A hack that makes your OS X menu bar black. And yes, it blends.
Ready for 10.9.2!
There is also a hidden preference for using a black menu bar in full screen:
defaults write -g NSFullScreenDarkMenu -bool true
It only affects full screen windows though. Some menu extras and status menus don't have graphics for a black background: