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.
Check out info on resin casting. You have a mold, mix the resin with a catalyst. Whatever is in the mold gets embedded in plastic. - This link doesn't include info, but it's a reminder to go check out more info on resin casting