Designed by Bitcraze, the Crazyflie Nano Quadcopter is an open source development kit to make your own tiny drones. It's $173 from Seeed Studio Depot and looks like great fun to make and fly! "Crazyflie Nano Quadcopter Kit 10-DOF with Crazyradio"
David Pescovitz is Boing Boing's co-editor/managing partner. He's also a research director at Institute for the Future. On Instagram, he's @pesco.