No reason to shyly approach them. If you have ulterior motives, they will know and it will have the opposite affect. I wouldn't do it. If, at the end of the rotation, you're sincerely grateful to the nurses or residents, such a gesture could be done as a thank you, but I wouldn't do it at the start of the rotation to break the ice. Instead, break the ice by meeting them and shaking their hands, asking their names (you'd be amazed how many nurses told me that students never even bothered to learn their names), and being humble. At this stage of your education, the nurses know more than you do. Make it clear you're there to learn and ask for help when you need it. Some of my best rotations were the ones in which the nurses trusted me enough to ask me if I wanted to order such and such for a patient. I was always shocked because I don't have the authority to order ice chips. But they'd ask because they said they trusted my judgment (toward the end of third year) and they wanted me to get more comfortable with it too. They also used to whisper to me in the corner about pimp questions/answers certain attendings were famous for asking so I'd be prepared on rounds.
The point is, never underestimate the value of the nurses. You don't need to suck up to them with goodies. Just have a good attitude and treat them well. They'll do the same.