The Death God's Nursery was made from Dollar Store foam core.
After assembly I spray painted the whole thing black.
I got some cheap battery-powered lights from Michael's and put down several layers of red and yellow crepe paper - the kind used to put in gift bags - which I used as paper mache for the lava. I painted the paper mache lava yellow with dry-brushed orange, red, and black, in that order.
I didn't get the diffused lighting I was hoping for. The lights were still clearly tiny pin-points of light.
I then painted the "visible" areas gray and painted on a 1" grid.
The balconies eventually curled up a bit, but it was good enough for one encounter.