I have been an intern in a company for the past 5 months. As I started here I was assigned into a project that happened to start around my starting date. We have a planning session for the last sprint of the project and I wanted to show some appreciation to the team members that I have had which helped me to make the best out of my internship. I am looking for different ways to do so and not to come out as creepy/awkward/minion/ass-kisser and etc. It's worth mentioning that I will be working as a permanent hire within couple of weeks!
Update: I work in US and my team members are mainly 40 to 50 plus one person in 20s like myself.