These are some jet board designs for sky surfing. they come with build-in mini jet engines and small anti-gravity discs to keep them levitated off the ground and into the skies. They also come in many different sizes from skateboard and snowboard size to surfboard size.
Artist's Note: I did this drawings when the anime "Eureka Seven" first came on TV over here in the USA. That's where I got my inspiration from. X3