I too like the last one, but also the first one with the turquoise.
I see you have used root wood for the stem of the first top: haven't you problems of warping, doing so ?
The aesthetics anyway is fantastic.
Thanks,
Root wood and burl wood (what I use), are really two completely different things. Burl-caps are technically a cancer usually found on the side of certain species of trees. Box Elder Burl (used on the 1st top, above) is a very punky, soft wood, and not very useful for turning. There is a way to fix this problem, by using a high pressure vacuum resin injection process called stabilization, plasticizing the wood. When a really soft wood is stabilized, its weight is often more than doubled through the addition of resin, making the wood much stronger, and turn-able...so you get the benefit of these beautiful burl eyes and veins, but none of the downside of a weak/soft wood.
BTW, "stabilizing" wood is a very time consuming and expensive process, and is used primarily by high-end custom knife makers. A typical piece of stabilized Box Elder, measuring 1" x 2" x 5" (intended for knife handle scales) will cost between $25 and $40.
Here's what a burl-cap looks like: