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1. Turbulence You're probably sick of me talking about this by now, but I can't get enough of it. It's a cheap, effective way to create fluidity without complicated formulas or resolution limitations mini.gmshaders.com/p/turbulence

2. Efficient Chaos If you need to scatter objects (e.g. stars), most would break the world into cells and scatter within those cells. This requires sampling all neighboring cells and gets expensive quick. This trick works fast in any number of dimensions: mini.gmshaders.com/p/chaos

3. Dot Noise We often need smooth noise functions for procedural generation and texturing, but we don't necessarily need to use Value, Perlin or Simplex noise. I wrote a simpler 3D noise function that is super fast mini.gmshaders.com/p/dot-noise