I have most of my jars filled now. Here are my vampire fangs (made of Sculpey - no vampires were harmed in the making of my Halloween!) ready to bake.
Here they are in their jar. I put a bit of black cheesecloth in the bottom of the jar for contrast.
As for my other experiments...
The tapioca jar is just fine. Stable as can be, still freaking people out. As for the rice, well, I think I made sake. We first noticed bubbles in the goo, then we noticed floating rice. Then came the smell. Oh God the smell. If you left the lid on, you were fine - but heaven help you if you took that lid off! So to sum it up: Tapioca, good. Rice, a one week only decoration.