The source code is in the larsi-org/LED_Editor GitHub repository.

Schneeflocke is basically a Hex 10 hexagon with 271 LEDs. To reduce wiring, it is pieced together from LED strips.

Building a back board.

Count Part Description
2 Addressable LED strip WS2812B 5M, 30 LEDs/m
1 Wooden board ¾" × 24" × 36" edge-glued unfinished spruce pine fir board

Here is the Arduino source code (check out the larsi-org/LED_Editor GitHub repository):





I wrote a pretty minimalistic editor for designing LED layouts and animations - now a live browser tool: try the LED Editor. Source in the larsi-org/LED_Editor GitHub repository.