About a month ago I got the idea I was going to make a circuit (including custom printed circuit board) tree ornament for our tree. Fast forward a few weeks and I now know how to do it, but don't think I'll find time in the next couple of weeks to actually get it done.
Because I still want to hang something on the tree I bought a Circuit Playground Express which is the approximate shape of what I had hoped to make, but with a whole lot more. At least my son and I can spend some time writing programs for it over the holiday break.
You can use the Arduino IDE to write programs, but you can also use code.org to write apps in your browser. My son uses Scratch at school so it'll be familiar to him.