The design thought on this was to give the light a stand where it could glow. I used LED tealights with this as I am printing in PLA. The design concept was to create a tall stand where you can place a tealight with a light diffuser.

The light diffuser should be printed in vase mode with at least 3-4 bottom layers and no top layers. The brand and material used will determine how well the light passes through there. You'll want something that is great for lithos. You can ultimately use a lithophane generator to create the diffuser if you wish, just make sure it's thin enough to allow the light of the LED tealight through.

The base filament is a silk filament I used from Polyalchemy.