A way of making your indoor plants as decorations is really beautiful :) I don't like the wood-look though. I think airplants are the only ones which will work. Other plants require water drainage etc.
DIY Tree Branch Seahorse **Mi(my) WAY: combine with the idea of the lit wood Christmas tree on the canvas, do any shape on the canvas then add lighting. Or weave lighting through out or around the seahorse or whatever u design.