Dude, you thought Cold Stone had mix-ins? Oh Yeah! has a list, including some of what people may consider crazy mix-ins, reaching over 100.
You order your ice cream from the bar up front, order your mix-in from a list (which includes Kit Kat, granola, coconut flake, biscotti..... bacon, super green super food, hemp protein... hops, salmon, turkey jerky... soy sauce, habanero... love, magic.... I want to know what Love and Magic are XD), they swirl it for you and their swirling machine, then you exchange money for what they're holding. Don't go too crazy with your mix-ins, they're a dollar a pop on top of the base ice cream price.
The place was quite packed when we got there, speaking for their popularity... though the guy behind the counter only half-smiled amusedly at us when we (okay, I) stared and then ordered. Did he even say anything?
For my first visit, I tried the sweet cream ice cream with azuki beans... which was pretty good. The soft serve was partway to a milk shake after the swirl, but still pretty good. I think I'll try me some salmon mix-in the next time I'm back.