Dead bug prototyping and freeform circuitry is the way to create circuits without a pcb. Requiring a magnifiyng glass, lot of patience, enables 3d circuits making and custom electronic devices packed in acrylic (maybe little dangerous with caps!). Check out this collection of incredible examples from the web. TallmanLabs headphone amplifier casting in resin O'Baka Arduino skeleton Peter Vogel Klang Objekte art installation Little wire dead bug art Electro-Music forum is a great source of freeform circuitry Freeformed 40106 + LDR Light Globe Synth Dead bug led cube, via instructables