Print a 3 foot by 4 foot photo at Staples for $5.00! They are called engineering prints. Its just printed on bond paper, not photo paper, but its so cool looking. I sent my photo online and it was ready to pick up in 15 minutes.
Wirh battwry operated kights, this would work in LARPing. You could make several colours such as white for winter or maybe pixies, blackened for a witches grotto, realistic colours for a ranger NPC encounter, etc. - DIY Flameless Fire Pit