I've been using 'Blue Gyro Alpha Romeo' (not like the car, and those are the last 2 letters of my call sign...). Most start calling me 'helicopter alpha romeo', including the helicopters. I don't bother to correct them.
I prefer gyrocopter, as it connotes that we are rotocraft and not winged craft. ATC doesn't know how to classify us, and most of the time they can't see me on the radar anyway. The funnest part is climbing from below runway altitude up to pattern altitude, since my home drome is on a mesa. Always with lots of communication, of course!