Axolotl Skull

You can pun some leds inside or neopixels, you may need some glue to put it together.

I used the materials listed here:

Lámpara LED de conducción a todo color, módulo redondo y cuadrado, 1/3/4/7/8/12/16/24/25/32/40/64 bits, WS2812 5050 RGB| | - AliExpress 

Here the microbit Program:

https://makecode.microbit.org/_ewq6oFF9MH5h