I don't know if it's the norm, but we like to bring something from our area for the cast members who do so much for us. We've brought decorated mini-pumpkins, candy, personalized ornaments - nothing hugely valuable. After the hurricanes we sent a slightly larger gift to the CMs in the planning office, as they were so stressed out with all the cancellations, rebookings, etc. The cast members are such a big part of what makes our stays memorable, we really enjoy doing something nice for them, if only to let them know how much they're appreciated. I have to add, I think it's also important to share your appreciation in a nice letter to the management.