The Gift That Keeps On Confusing

The holiday season is upon us, and I'm left with an interesting question about gift giving. What is the appropriate gift for my son's day care providers?

A bit of background. My son has been attending since July, and it's five days a week, all day. It's a day care center (as opposed to a home based business) with multiple teachers, some of whom are full-time, some part-time. There are as many as eight teachers, and there are often subs from other rooms. To complicate matters, Baby Banana only moved into his current room two weeks ago - for his first 4 months he was in a different room with different teachers (6 of them). It's a Jewish day care, but most of the teachers are not Jewish.

I know that the rule of thumb with nannies involves giving them an extra week (or more) of salary as a holiday bonus, but I wouldn't know how to begin to translate that into this context (not only do I have no idea how much these folks make, and needless to say I can't give each of them a week's salary!). Is this a cash situation? A gift certificate situation? A gift situation? Some combination? Does everyone get the same amount/thing regardless of whether they are part or full time? Do I get something for subs who I've gotten to know? And perhaps most importantly, how do I deal with old room teachers and new room teachers? Thankfully, this year timing is not an issue as Chanukah starts on Christmas.

Thoughts are appreciated. Keep in mind that I want to be generous, but I don't want to go overboard and be seen as one of "those" parents.