Hey Gene, Don't worry about asking questions, that's what we are here for!
I use both 1/8" and 1/4"woods. I use what ever I have on hand. I have cut ornaments out of Baltic birch, Maple, Walnut, Alder, Mahogany, Cherry, Sapele and Red Heart. I will not use softwoods like pine because they tend to break easily.
I also stack cut my ornaments. For 1/8" woods, I will stack three or four layers. For 1/4" woods, I will stack two or three layers.