Ever wanted to make your Mac black and white ? Even if not, it never hurts to know how. Short concise tutorial on how to make your Mac's screen B&W.
Either way, here's a step by step tutorial on how to do so. (Scroll down for the Video Tutorial)
Step by Step Tutorial (Text)
This tutorial is meant for users of Mac OS X Lion (10.7) but will work for users of older versions of Mac OS X too.
1. Open up System Preferences (Click on the Apple Button in the menubar on the top-left of your screen --> System Preferences)
2. Click on Universal Access (Under Personal)
3. In the Display panel, checkmark the box labeled 'Use grayscale'.
4. That's all there is to it! To turn your computer back to its usual bright and colorful state, simply uncheck the same box.
Step by Step Tutorial (Video)