Not a nurse but I am usually surrounded by them. What about nice coffee. Here you can get a big carafe from a local shop and bring in nice creamers and stuff?
We always brought big bags of good ground coffee to the break room in the PICU. The coffee they got was nasty and cheap and it was really appreciated. We've also ordered pizzas and on another occasion brought in a bunch of individually wrapped snacks.
Also not a nurse, but I would love it if someone brought in a box of muffins/cookies/donuts from a local bakery. Not talking fancy, I mean like Tim Hortons in my case, possibly DD in yours.