"A lot of the Jokers do rainbowy coins, actually. The eponymous Joker, the one who works for my mom, makes these -" She pulls out a clear triangle, also streaked. "It's not always clear why coin colors are what they are, though. Sometimes they're obvious." She tugs at her hair. Then she pulls out one of her mother's triangles, gold and glowy. "Bells' coins glow if they have native magic for defense against mental spying and tampering, in all different solid colors, and they're other, non-glowy patterns if they don't. Do you want to see what yours would be?"