GB Camera
I happened to find an old Game Boy camera on a jumble sale. The thing as such is not worth much, got it for a few bucks. But the image sensor can be used to make low-res pictures using a microcontroller with an ADC.

The extracted M64282FP. Quick and dirty wired up to an ATmega32. The datasheet can be found in the internet.

The picture is displayed in a little Windows application.

Thats it... :-)