A 200-in-one electronics test lab. It's got a bunch of various electronics components and little inverted springs for connecting wires to https://digipres.club/system/media_attachments/files/111/915/349/624/080/159/original/763cdf1ff45a32ed.jpg
What I want to see someone make: one of those Radio Shack 200-in-one electronics lab kits, but it's arduino compatible.