Barkus Labs made a cool LED graduation hat.

Using a 32×32 neopixel display, a Teensy 3.2, and a bluetooth module, he was able to make the display programable via a smart phone.  He has an additional video showing the code for the project as well as a link to a Google drive with the code.

His build inspired Sirrom0206 to build an LED graduation cap for a friend’s son.  He posted a video about the build here.