I don't have any recent shots to show it planted, but here is a branch feature I made with Vivarium Works casting epoxy
over a foam core and with Hygrolon
glued in place as a planting surface...
Rather than using a branch with epiphytes in front of a regular vivarium background, think about designing it as the main feature in front of a black or open background. This will give you negative space in the layout and a much more dramatic effect.