I have a "copter" of some description, except the whole thing spins. There's the central little body, two wings (at 12:00 and 6:00 say), and two arms with small props (3:00 & 9:00), which thrust horizontally, not vertically. Hovering is...a challenge.
My first thought when I got one of those boards was to build a quadcopter, but then I decided that was too conventional, so I elected to build a tricopter. The three motor setup makes yaw control a challenge, as it is coupled with the other degrees of freedom, but that was to be part of the fun. Not gotten very far along, I'm sad to say.