The lava background is a background in TheoTown to be lava.
The lava background is not only in TheoTown:
-except in TheoTown, the sun is a full of the lava!
-The Mercury has some layers in the body of the planet; those layers are just lava!
-The Venus has some layers in the body of the planet; those layers are just lava!
-Also, the Earth has some layers in the body of the planet; those layers are just lava!
-The Mars has some layers in the body of the planet; those layers are just lava!
-The latest one, the Jupiter has some layers in the body of the planet; those layers are just lava!
If you have questions about this plugin, feel free to comment here!