The proliferation of spoof, nerd, science, and electronics merit badges has demonstrated that geeks like to show off their skills and accomplishments. One skill is particularly appropriate for the format: soft circuitry. By building your own soft circuit onto an actual badge you can demonstrate your mastery.
The size of the badge is just right for a simple circuit with a battery, a switch and an LED. The crowning touch is that the stitched circuitry can form the circuit diagram as well.