I drew up a little schematic, and with some jiggery-pokery and a thin speaker in place of a buzzer it just fits. I also found some super-bright LEDs, and a red magic marker. Red is much cooler. Anyways, on with the building!
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Step 1: The Stuff
That said, you will need:
a magic marker,
and a mini-usb port (mine broke so I went with the audio jack and rigged a custom charger).
The new stuff!
A pair of supercaps! these will be in series for a nice 5v, which is also what USB provides.
556 IC! Basically, it's a pair of conjoined 555's.
LED's! I found some cheap ones at that link.
An earbud speaker, or similar small noisy device.
Some capacitors and resistors; capacitors are 10, 0.1, and 0.01 uf. resistors will vary.
scissors, craft knife, pliers,superglue, a drill, and soldering stuff.