cartoons from when you were a kid! i did this theme when i was an RA about 6 or 7 years ago, so a lot of my residents grew up watching cartoons in the late 80s / early 90s (gem, smurfs, strawberry shortcake, rainbow brite...). you could have a different cartoon character/scene for each nametag and big cartoons on the wall. and then you could have a "guess this cartoon" sort of game as your first icebreaker. it was an easy theme that my residents enjoyed.
best of luck on your new RA job!