Uwajimaya Asian grocery store and picked up some tapioca pearls to test out. I picked up three varieties, "black", "black sugar", and a mixed color. There wasn't a lot of descriptive text on the packaging, it was mostly what you see is what you get. I like the black in contrast to the pumpkin liqueur and while I haven't tasted all of them yet, I think the two black types may be very similar, they are in appearance after being boiled.
They are very simple to prepare, they just need boiling for 5-10 minutes and they are ready to go. They have the consistency of gummy worms but not much flavor. They do tend to pick up the flavor of whatever they are in, so I'm testing soaking them in pumpkin liqueur to see how they taste.