The soft, glowing circles of out-of-focus lights, drifting slowly upwards through a dusky plum haze. Lights sit at three depths: many small far ones, a middle layer, and a few large, very soft ones close to the lens. Each one fades in, rises a little and fades away, with the faint bright rim that real lens blur gives.

Gold, pink and lilac on plum by default: a romantic background for wedding, beauty, fragrance and evening pages, invitations and title cards. Set the two background colours and three light colours, and how many lights there are, their size, blur and glow. The demo has three presets: Plum dusk, Champagne night and Lilac haze.

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 2.3 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.