For the Tree in Holiday Hideaway, in Walkabout Mini Golf, I created effects and shaders for two types of Christmas bulbs. One was a bubble bulb that the lead designer for the course remembered from his childhood. After looking up some references, I recreated them by setting up geo that would displace using vertex colors to simulate the liquid inside, and then I added bubble particles to finalize the look. For the other bulbs, I wanted them to match how I remember Christmas lights on my tree growing up, so I created a starburst twinkle mask that I could add as a particle on each light and have it face and move with the player, adding noise to the emission to create the twinkling effect.