I am also fortunate to work at a school with a lot of parent involvement. I have 10 parents who have come in consistently to work in my class each week, so I need to do something for them as well. I always like to keep it simple. Nowadays I always start with Pinterest to see all of the great ideas. There are so many choices, it's hard to narrow it down to what I like.
Here is what I put together, a "Thanks a Late" bag. Inside each bag is a mocha drink (I know it is not a latte, but that is what Costco had) and a small bag of chocolate covered coffee beans. I made them tags, cut them with a circle punch and put them in a bag. I always have these kraft bags around. They are simple and can be dressed up to fit any occasion.
Here are the labels (freebie). I warn you, these are not a template to labels or anything. I just used a 2.5" circle punch to cut them out.
Do you have parent helpers? If so, what do you do for thank you gifts? I would love to hear your ideas.