OP, I think you are really appreciative of your team for working extra hard during your vacation. But that's what teams do for each other and everyone deserves a vacation.
To be honest, I don't think a button or soap/lotion you get for free would make me feel appreciated. And not everyone is as Disney crazy as we are.
I would buy some Disney cookies/treats and bring in coffee to the office and thank everyone one. Or even buy lunch one day.
While thanking them is a great idea, I don't think it has to be Disney related just because that is where you went on your vacation.