The 8-Bit Lair course in Walkabout Mini Golf incorporated several tech art techniques to achieve the look. The city in the background doubled as an equalizer readout for the background music, where I exposed the values to drive it and worked with the sound designer to tie it together.
The ocean was actually a particle system that spawned cubes at points defined in a mesh I created using a grid. Each block was then randomly shifted in color and used a sine operation to move up and down randomly, achieving the desired effect.
The tower spawns particles along the edges of a quad at the tower base and uses noise to add a chaotic look as they are lifted. The sparks are placed on the lines using UVs and utilize layers of transparencies to achieve the look.
Lastly, the digital river used various masks to get the flowing look and a scrolling effect for the light circles.