I picked up a cheap, wooden jewelry box from a local craft store for around $5 a while back, and it's been collecting dust on my desk ever since. Lately I've grown tired of looking at it and have decided that it's time to do something with it. One of my hobbies is building guitar effects pedals and thought it would be nice to have a small amp for testing purposes in my project room.
The circuit design comes from runoffgroove.com
and is a great beginner electronic project. The amp has few parts, is inexpensive, sounds great and has impressive power, considering it runs on a 9V battery. It will even power my 4 x 12" guitar cabinet! (Not at gig levels, but great for practice)