Arduino and electronic projects
A lot of time has been spent on Arduino (microprocessor board) projects. These range from a coffin that opens when someone approaches (complete with skull and glowing eyes) for Halloween, to an arrow sign with flashing LEDs and various other LED projects. None of these look much in a photo, much more impressive in real life.
The Arduino boards (or Chines clones of Arduino boards) can be had for about $2.50 off eBay, so I have built up a stock of them, just waiting for a project to beckon. I have also accumulated some ESP8266 boards to experiment with internet control.
The laser cutter makes a great adjunct to electronics, as you can custom make cases for the circuitry.