3D backgrounds DIY. pics on project need some help

[Noddy]

wow man how did you make the rock look

Just take thick stryrofoam say 8" and start with that.
After cutting use a torch to round of the edges.

My background is epoxied and by adding some sand just after finishing with the resin, will give a more natural look, for the epoxi itself will be a bit shiny.

 

[manlyfish]

sweet im doin it

 

[Yumu]

Sick tank!!!