Dry holly is very white,fun to turn and good for all sorts of things. I use it for Inlays, segmented work and finials of all sorts. It polishes up to a high shine and is very stable.
Green holly will move a lot after turning, starts turning gray to green very quickly but other than that is a good wood to turn. It is hard but cuts well. If you turn the wood quickly and fairly thin it may dry quite white. I use the John Jordan method of blowing the water out of it to keep it white but have still had it pick up some gray in some areas.