I'm a teacher and some of the good presents I have received are:
Coffee vouchers ($10 ones are good enough for coffee and cake)
One year my class teamed up
And got me a voucher for a day spa
I have received tea leaves and nice ground coffee before
I didn't like getting mugs because none of them would match! I got some many boxes of favourites last year that people that came to visit us over the break got a box to take home with them.
My favourite thing was just to get a nice card with a nice message inside....
It's a nice idea to do handmade gifts but I remember one year I got four painted pots.... I ran out of space in my home.
Maybe find out what the carers/teachers are into... For example me I love dangly earrings, the louder the better, maybe pay attention to that and see if you can find something unique