This is a fun and simple project I did with friends, where we made cardboard mushroom hats with sound reactive LEDs.
Cardboard structure
The simple hat structure was modeled in Fusion360, then put through Slicer for Fusion 360 with a radial slice to get the layout, which we could then laser cut from cardboard.
This let us have a sturdy, lightweight cardboard hat.
LEDs
We cut notches in the hat so that we could place the LEDs in three layers. A friend soldered them together, and then to an ESP8266, which allowed us to program the lights using WLED and LEDFX. The ESP8266 was connected to a portable battery so that we could wear the hats and move around. The ESP8266 has WiFi, so we were able to control the LEDs from our phones.
Finishing Touches
I cut large red fabric covers with holes to go over the top of the mushroom, and hot glued tulle to the bottoms for aesthetics. I then added a large yarn rope so they would stay on our heads, and the mushrooms were done! :)