Cant speak for any audio, but electronics can cover a broad range of things. So i will start by talking about LED lighting. I have close to 150 LED's on my bike at the moment with about 100 more to be put on in the next few weeks. They draw so little power and give off so much light and are so small, they can be put anywhere.
Alot of creative things can be done with them too,
any cool ideas, i would like to hear about them.