I'm not sure if their DIY or some Chinese manufacturer made them, but they look impressive.
http://www.youtube.com/watch?v=kd3QPopC1WA
http://www.youtube.com/watch?v=57uG6KYrUJA
http://www.youtube.com/watch?v=AWaPqtpmgco
http://www.youtube.com/watch?v=kd3QPopC1WA
http://www.youtube.com/watch?v=57uG6KYrUJA
http://www.youtube.com/watch?v=AWaPqtpmgco