Moonstone, which in a way is like an opal; the way the light hits it at any particular moment causes different colors to come out of it. In an opal it’s called one thing, though; in a moonstone the phenomenon is adularisation.
diy bedroom idea could maybe work in shelves. I love the idea of re-purposing. Maybe use old shipping pallets for the wood. Knowing I've re-used something helps me sleep well....along with some help from Midnight Sleep Aid #GotItFree