Hi Michele:
I always get my daughter's teachers -that is the one I actually think do a good job teaching my girls, the others, forget it!- a really good read. I teach also and there can be little time to lose myself in a good book during term time. Many teachers I know who also love language and spend so much time reading to their charges love the opportunity to lose themselves in a book in the vacation. It may be their only chance.
You might try alo giving gift certificates to a movie theatre, or a nice bottle of wine, a selection of exquisite jams and pickles and marmalades, making some home-made lemon curd amd bottling it in pretty jars, perhaps make it a gift that serves that teacher's classroom (what does your child's classroom need?), a gift certificate to a spa for a facial, or massage, or manicure (if teacher is female).
Take a look at this month's copies of Oprah and Real Simple magazine: they have many more suggestions in them.
But also I encourage my girls to make a present for their teacher, some kind of art project. This can be simple or more involved, depending on the age of your child. Once, my kindergartner painted some rocks she saved from a trip to the Michigan UP and gave them to her teacher in a cheerful basket! Her teacher loved them! Excellent as door stoppers, paper weights, etc. My eldest daughter has printed patterns on white t-shirts, and has used stencils to paint delicate patterns on both sides of a canvas tote bag. These were both loved and I have seen the teachers actually using their tote bags and using them to carry their school books in! You can get all the supplies from craft shops, like Michaels here in Michigan.
You don't need to go over the top though. I usually devote more time, attention, thought to the end of year gift, rather than the Christmas gift, then I link it to praising and thanking the teacher for their excellence and the differnece they have made in my girls' education, rather than to a religious festival that not all may celebrate.
You know, one year I made cakes and they went down well. This year I may make a special chocolate delicacy-dessert that I make as my trademark dessert: chocolate profiteroles. I usually make these for the teacher's luncheon sponsored by the parents in April or May: and theyare snapped up in seconds. What kind of special desserts are yuo known for? Make some of those and hand them out!
Good luck,
CLare