Draw!

Draw and flash on the go! This app is for easy finger communication in loud places, making quick notes or keeping kids entertained.

PS: Does not work on all devices. My apologies. See comments

PS If you have a Tablet, you should check out the tablet optimized version! That version supports landscape too.

Features:

Colorpicker
Pen width control
Save to Gallery
Delete
Duo Pens
Eraser
Send
Preferences
Multiple sets
Slideshow
Multiple undo
Panning
Importing backgrounds
Curved text adding with gesture recognition
Flip `n shake
color dropper
BONUS: draw with camera on
BONUS mini game: Red vs Blue (playable with Bluetooth)
BONUS mini game: JigSaw!
BONUS: Live Wallpaper (to flip through your Gallery, so when where there are no saved images there is nothing to see...)

...see also the Tips and Tricks page