A lava lamp as a background. Soft wax blobs rise and sink, slowing at the top and bottom, stretching as they travel, merging when they meet and pulling apart again, over a pool of wax along the bottom. The edges are smooth at any size, with a gentle tinted halo.

Coral, tangerine and pink on cream by default: a cheerful, retro look for fun brands, playlists, food and drink, kids' and party pages. Set the background and three wax colours, blob size, edge softness, glow and the pool. The demo has three presets: Sunset wax, Bubblegum and Night lamp.

What you get: a GLSL ES 3.00 fragment shader for plain WebGL2, an ES module that returns a three.js ShaderMaterial, a Shadertoy version, and a demo page that runs offline with a small settings panel. For video editors there is a 10-second 1920 x 1080 H.264 loop that plays end to start without a seam.

It runs in one pass with no textures needed, at about 0.5 ms of GPU time per frame at 1920 x 1080 on a recent laptop. The README covers set-up in WebGL2, three.js and Shadertoy, every uniform with its default and range, and performance notes.