This started out just as a test to create some marble material, but then it grew a bit ;). Now it's "blend in Blend files" :). So, this is 100% Blender 2.92, with 100% procedural material. Hope you like it :D.
Finished Render
Clay render
Material (Procedural) cigarette
Material (Procedural) Ashtray, marble
Material (procedural) Ash