My idea is to have a snowboard / mountain skateboard with big wheels (there will be a button for changing modes). I will use snowboard to go down a snowy hill; in case there are rocks, dirt or a road I will be able to change the mode just pressing the button and the wheels will pop out.

It would be really great to have sound filters for windows. They could work much like the mosquito nets. In case you fastened such a filter on the outside of your window it'd keep out all the street noise, but would let in the fresh air.

I'm a soccer player. It is a real disaster for me to have a game on a sunny day as I hardly see anything and often lose the ball. My idea is to create sunglasses that are contacts so as I could look into the sun and see the ball.

I'd like to have a wrist watch that could be set to alarm every 30 minutes, or every 2 hours, or whatever intervals were needed. It should vibrate but not sound in order not to disturb anybody and keep the reason of alarm private. The watch could be used as a reminder to take a medicine or do some exercises.

It would be awesome to have a foldable badminton racket. Folding may impact the strength of the racket but this seems to be resolved by the racket design.