If you don’t use Mac Menu Bar regularly then you can using this app you can set option to hide Mac OS X menu when it’s not in use. You can see the image posted below which shows the Mac OS X menu bar in dimly “hidden” mode.
When you move the cursor over menubar it will again brightens up. You can see the image posted below which shows menu bar brightens up when the cursor is over the menubar.
Menu Eclipse 2.0.1 is compatible with Mac OS X 10.6 or higher. This app is available through the Mac App Store in the Utilities category. It costs $1.99 USD. You can download and get more information about Menu Eclipse 2.0.1 from here.