The guy in this video demonstrates a Rubens Tube. He has a speaker at one end of a piece of PVC pipe that contains holes. He runs propane into the tube and lights it up like a camp stove. The pipes sound through the speaker and the sound waves compress the air in the tube giving the sound wave visualization in the flames.
Here's a custom project where a guy made a hot air balloon shaped like Darth Vader's head. The article about it is somewhat light on details but it does say they sent a 3D object file to the hot air balloon manufacturers and then made custom modifications once they received the final balloon.
Here is an interesting article about an inventor from England who has created a hoverdrone. It is basically a cross between a hovercraft and a helicopter which looks like a flying saucer. It's shaped like a bell with the rotating blade above the bellshape. The air is forced down around the sides of the bell which I assume causes lift. This thing looks like the hover drones from the Dark Angel TV series. The real question is can they scale this thing up so it can carry a human?
Guy puts on a skydiving wing suit, straps a jet engine to each of his feet, and jumps off of a hot air balloon for a good time in this video. It doesn't look like it would be very easy to land with the jet engines on his feet but I assume he just pops a parachute.
In this interesting video they demonstrate a working orithopter model which flies around a school gym. A orithopter is an airplane that flats it's wings like a bird. It's hard to tell what is powering the flapping wings in this video. It could be a rubberband or a really small battery motor.
This video is three different zero gravity experiments done on the ISS. The first clip is of how waves behave in a zero gravity sphere of water. The second shows an air bubble inside the sphere and the third shows an antacid tablet activating in a zero gravity water sphere.
The remote controlled vehicles in this video look like racing boats but they can also drive around on land and fly. The video is pretty poor quality but it starts out with the boats on water and then has them fly up into the air. When they shoot the boat straight up it goes at least 50 feet into the air before coming back down and landing.
In this video a guy in Japan shows off a mech he built for around $300,000. It looks like a mech but the legs don't actually lift off the ground and seem to just slide along like the feet have rollers under them. He has air cannons mounted on either side.
In this video a guy gets carried up on a updraft while kite surfing. He's in the air for about thirty eight seconds or some before coming back down. He moves in over land up to about two hundred feet or so before coming back down and crashing into the dirt.