Generally, once one has come up with plans for blinking LEDs that require more IO than is available on the Arduino Uno, one graduates ... Star Fox port to the Arduboy. Video after the break.

[Damian Peckett] has implemented an Apple ][, its 6502 processor, and a cassette port, all on an Arduino Uno. If that wasn’t enough, he also uses a PS/2 keyboard for input and outputs analog VGA.