DIY Forges: not forgery, but making your own smithy. There are plenty of variations available, but there's something special when a teenage boy builds his own forge and teaches himself black smithing.
Roses on a piano, tulips on an organ (as mentioned here), but who knew that there are so many people who make their own pipe organs or illustrate how to make pipes (simple or complex).
Geeks are alive and well. You too can build a stand-alone web cam for $55 to pair with your $25 web server.