ScreenTag

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ScreenTag allows to write on your screen over any application, allowing you, for example to paint faces on your boss during a video conference or write note on a web page.
Then you can save your drawing/note by simply making a screenshot (you can take a screenshot by pressing and holding power and volume down buttons).
If your boss is too boring, "Angry mode" will allow you to frenetically scratch his face to calm your nerves.
"Angry mode" is a kind of "Etch a sketch" mode, where you can only write a single continuous line. Every time you take of your finger from the screen, the created picture will be saved. You can then reload each picture to see your creation and make screenshots if you want.
If you have children, the "Rainbow mode" will probably please them.

Note that in version 1.0, with Android 5 Lollipop, ScreenTag can't be displayed over the lock screen or applications displayed over the lock screen.