The pong clock cool? How about this then...

[Felsir]

a pong watch.

Very neat:
"The display is a small (1.2") 96x64 yellow-and-white OLED display. OLEDs are neat because only consume power proportional to the number of pixels that are turned on -- for a game like pong, that's a relatively small 1-2% of the display, so the power requirements are pretty small. Plus, the high contrast looks great with a game like this. I haven't worked out the power budget in detail yet, but hopefully I can get a day's use out of the watch, and then recharge the battery each night. The charger would also automatically set the time, so there will be no need for buttons on the watch."