The folks at Iowa Public Television unearthed this wonderful 15-minute video from 1969 in which a young Jim Henson teaches you how to make puppets from ordinary household objects. If you can get past the slightly jarring image of Henson talking to Rowlf, a Muppet that was of course one that he typically performed, it really is an amazing video.
I wonder how many more treasures like this one await rediscovery, like perhaps the Part 2 that Henson mentions at the end of this one.
(Huge thanks to fellow GeekDad Dave Banks for pointing me to this video.)