Planted Tank Guru
Join Date: Jul 2008
Location: East Lansing, MI, USA
Given your location I'd go for alien technology.
As to a background, consider a plastic garbage bag crunched up and taped in place with bulges and loose areas. That will give you a bit of an illusion of depth and it's removable with out using a razor blade. Light re-strike is improved over a flat coating as well.