I like the thought of sending serial print commands to my TV set. This shield, by the awesomely named Batsocks, was designed to do just that. It was originally designed for PAL signals, but has been modified now to output to NTSC sets as well.

This would be useful for picture-in-picture mode on a TV set while debugging Arduino-based video game cheating projects

tmate0.png

tmate2.png

tmate1.png

Batsocks