Skate Board
I spent a good amount of time while in college for mechanical engineering working on a custom electronic skate board project.
With a battery, speakers, a seat, and LED lights this mode of transport has almost everything you need.
This project gave me a better understanding of electronic components and wiring. It was a lot of fun to work and improve on some thing I personally use every day
You can learn more about this project from Layers Media’s Article on the subject HERE