DS is going to transition into the PreK room at his daycare next week and I'd like to give a little something to each of his current teachers as a thank you.

The thing is there are 4 teachers in the current class - 2 full time and 2 part-time college aged assistants. Suggestions?

ETA: I normally would give a Starbucks or Dunkin gift card but I was wondering if there was something more personal or thoughtful I could do instead? I wish my kid was more into coloring pictures but he's not doing that much lately.