Uh oh! Now I just went and looked at the Troll glass, because I have been looking for some Black Murano's, and not thrilled with the Pandora selection. I have mostly Pandora, but am not a purist. How do the Troll beads mix? I think Pandora doesn't fit on their bracelets, but you can put a troll bead on a pandora bracelet?
Also try looking at Etsy as there are some wonderful glass workers making silve core beads that fit on Pandora. Plus, some will even do custom work for you.