I found one for a star (but it’s also a sphere so miiight be useful?) Looking for examples of luminous/glowing/energy/etc. stars - Questions - Babylon.js (babylonjs.com)
This one in a retro style by @Pryme8 Assetless Retro Remake - #5 by Pryme8
An older demo: Website/build/Demos/Planet at master · BabylonJS/Website (github.com)
Unfortunately I couldn’t find any more 