A very new and innovative idea,
http://spectrum.ieee.org/automaton/robotics/aerial-robots/iros-2013-should-quadrotors-all-look-like-this
http://www.youtube.com/watch?v=TnGhEInTXYc
Thats a good and cool idea !!!! :)
http://www.youtube.com/watch?v=22lSfIn_lHs