For a reveu show I designed a costume for Electra. She wanted to have lights on her arms and leggs and wanted to control them herself.
Everything had to fit in her panty what was exactley the size of the Lilypad Arduino.
all wires are silver conduct wire, battery is 1000mAh Lipo, 50 pieces of 30mA 5mm LED on 5 circuits switched with 2N2222A transistors. She placed a little button in her costume so she could switch between the different circuits.
Wow!
And, err, um, minimalist.