Not very impressive at a first glance but....
I stuck a battery powered tea light in the center and it looks pretty cool. The light actually flickers which adds the effect.
(1) cut the poly styrene in a ring with the teak light in the center
(2) Bevel the sides
(3) paint black and then dry brush dark great
(4) Hot glue the twigs along the beveled sides (leaving enough gaps for the light to shine out
(5) Run in some soot from the fire place and the lightly seal.
I bought 24 of the tea lights on Amazon for $12.00, so expect to see several more "lighted" terrain projects.