This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/4kBx5EAtvpz
I made this for my son to his 10th birthday. He was very happy and proud of this as it also had the same colours as his new bike. Quite tricky to get the Voronoi pattern into each shape, but I could figure it out. When you ungroup the design, you'll see how it works :-)
voronoi_10_birthday_sign.stl | 139.0KB |