I need a spray foam that is chemical free and environmentally friendly. It must be sand-able and/or sculpt-able in some way. It does NOT need to have very good insulation qualities because it is being used solely in a temporary interior installation. The idea is to sculpt a brick wall texture into it and use this as a cheaper, lighter, and recycle-able alternative to actual bricks. Color and texture is not important as well.

Thank you my fellow enviro-conscious minds!