Okay, I'll share You two of my paperplanes. A normal one, and a stunt one. In fact, the stunt one is the same as the normal one, just two more steps needed. In picture 14, You can see the normal one. Just throw it, and it'll fly like a normal plane. And if you release it upside down in a more than 1.5 m (~5ft) height upside down, it will turn around, and it'll land on it's downside.
For the stunt plane, you can experiment with the 4 flaps. For example if you fold the 2 flaps on the plane's right downside, and upside on the plane's left, the plane'll do rolls counter-clockwise.
Thank's for watching.
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