Well this is not fish related, but I'm using the same principal as the way I make 3D backgrounds so I thought you guys might like to see this project perhaps. Anyone that knows me knows I'm not happy unless I have 50 different projects all going at the same time, so in addition to all the rod orders I'm working on, the big 265g tank project, and the zombie 3D project, I've also been working on this as well.
If you remember one of my other hobbies are Bonsai trees, and with the cost of bonsai pots being so high I decided I wanted to make my own and have it looks like a real rock scene with the tree placed inside of a rock structure like "pot".
Started out with cutting and siliconing three pieces of foam together

Then cut out the first two layers of foam in the center section leaving the bottom layer as a base

Carved/shaped and hit with the heat gun

First coat of drylok.

After the first coat dries then I will be going over the seams between the pieces with some body filler and smoothing those out so the seams are no longer visible. Then it'll be time to shade and highlight the rocks and seal it. I'll post more pics as I progress.