Force Android to display in grayscale Is there a way to force all of Android to display in monochrome(also known as grayscale)?

I'm working with a someone who has ADHD (and I am mildly ADHD myself). The colors are too much for him/her to handle.

EDIT: Ideally I'm looking to create an easy way to toggle such a setting.
Android 5.0 Lollipop provides this feature by default:


Enable Developer mode (by tapping build number within Settings > About phone multiple times)
Go to Developer Options and turn it on.
Under Hardware accelerated rendering you will see option called Simulate color space, click it and set it to Monochromacy.