This instructable is showing how to use the power of the USB PORT of the computer or laptop instead of batteries.
Lots of gadgets are made for the USB PORT nowadays, lamps, ventilators and small vacuum cleaners.
Why don't you try to make something funny yourself, using the USB?
This instructable very low tech, demanding your inventor and designer skills more than electronics. And no programming!
We will take one of these gadgets as a starting point (they are very cheap, 1-2 euro's) and make something experimental out of it, demonstrating the paper button principle. It is like having a very superficial dream compared to working with programmable chips and sensors and complex wiring jobs.
We use the principle of the paper button:
( see this instructable: http://www.instructables.com/id/Paper-button/