My mom is a teacher (20+ years) and last year she went on and on about a monogrammed cup (like a large plastic reusable slurpie cup) she got from one of her kids. I was like really ???
Otherwise, she gets lots of gift cards and appreciates them so much. She gets a lot to panera. (Her principal lists each teacher's favorite places.) And, my mom takes my siblings and I out to lunch with them. Each time she looks on the card and thanks the child. She'll say, "thank you Ava." And, then she might talk about Ava for a bit.
She also always gets a bunch of candles and knick knacks. It is crazy, but every year she shows me what she got, and my 50 year old mom still gets sparkles in her eyes talking to me her 'loot' and her special kids.