This was a fun and easy project to help me wrap my mind around some basic electronics principles.

The circuit is made of a few resistors, transistors, capacitors and LEDs.  I got the circuit diagram from: http://wild-bohemian.com/electronics/flasher.html

http://wild-bohemian.com/electronics/flasher.html

I used Fritzing to help me design the layout.  Grab my file here.