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.
keep shells in open container in fridge. When full, crush shells into small bits and sprinkle around base of plants. Sharp eggshells will deter slugs, snails, and other bugs from nibbling on garden and add touch of calcium to soil.