Bar Spin - You need a good ramp that has a nice lip and speed. Hit the ramp as you normally would and kind of tuck your knees under the nose of the seat. Lean your body backwards and spin the bars by removing one hand and taking the hand still hanging on and spin. Wait until the bars have spun, then catch them and land. Don't get discouraged if you screw up a couple times, also the front wheel may dip a little and if this happens, clinch your knees and lean back more. It takes time, so keep trying.
Nac-nac - A cross between a can-can and a swingout, only you swing the rear of your bike to the right and take your right foot and swing it way back around behind you. And like you should always do, return to a normal riding position before landing.
X-up - Turn your bars a full 180 degrees and then turn them back to their normal position. Hold on with just your index finger and thumb to help get the bars all the way around. If you hold on too tight, your bike will swing out to the side.
Flattie - Do a table top without turning your bars.
Tabletop - Turn your bars to one direction and tip your bike horizontally the other direction. You end up turning your bike on its side and parallel to the ground.
Nothing - While in the air, let go of the handlebars and jump off the pedals. Now comes the secret part, try to land back on the bike and land safely.
No-footed Can-can - Take both feet off the pedals and and stick them both out to the same side of the bike. Bring them in and land.
360 - You don't really need much air to do a 360. Start the rotation before the bike completely leaves the ground. Don't go too fast at first. Start to turn before your bike leaves the ground. Turn your head and handlebars hard to one direction. Where your head leads, your body follows. Don't focus any where on the ground but the landing ramp. Because where you focus is where you stop rotating.