This is a very simple homemade, USB rechargeable, super-bright flashlight. It’s a cool project to try out as a beginner. And it’s useful:
This guy created a really cool drum machine and automatic bass, by using an arduino to control a bunch of solenoids. Includes a cool video:
I know many are interested in solar power. The following tutorial explains how to make your own solar panels. It lacks some details, but gives a good overview:
The biggest issue, is probably to get the cells. I found a discussion on this here:
Keep on Soldering!
PS! Need a boost to get yourself building circuits? Check out my eBook “Getting Started With Electronics”: