I had a parent order me a set of personalized note cards my first year... I actually still have them, because I love them and don't want to use them up!
As a teacher, you are supposed to model everything for your students, particularly in the elementary arena. I am so sorry you have not received any kind of thank you... the only excuses I can think of that might ease your feelings are (1) if the teacher(s) had huge class sizes, and it was all he/she could do to just get through all of the work every day, or (2) if the teacher gave you a verbal thank you (or even an e-mail that may have gotten lost in the spambox?) and figured that was enough.
Neither of those would make it RIGHT, just a thought.
But your work is amazing! I would take em, too - and then use one to thank you!