I was at a friends place a year or so ago & there was a girl there that made beaded jewellery. She had some glass beads with her made by a glassblower she knows. Some of the beads had a mushroom in them, & some had interesting patterns. I paid $10 for the bead pictured, I thought it was the coolest looking of the bunch. There were a couple others that were exceptionally nice too, it was a tough choice.
Tricky, find out more from that glassblower at the coffee shop. I don't know much about glassblowing, but anything hand made isn't cheap. Maybe there's a trick & once you're set up you can bang them out quick. There was a lot if detail, & several colours in the beads I saw, I'll try & get some more detailed shots of the "mycellium" in my bead.