While I can't speak for other teachers, here are some of my favourites and the ones I remember fondly.
The funniest one, I cannot find a photograph for. It was back when mobile phones had no cameras and my darling class gave me 2 mango fruit which I ate! They had noticed that their teacher, i.e. me, never repeated her wardrobe which consisted mostly of Mango outfits. So come Teachers' Day, their corny 18 year old humour had them present me two HUGE mangoes. And to top it off, a T-shirt that I still have.
And then there were the ones from students who knew me and understood that teachers were human and appreciated the same things they did.
So they've come bearing cups of MacD's iced tea because they'd seen me come into class with it and we had chatted enough for them to know that I would mainline the stuff if I could. (This is no longer relevant as MacD's iced tea has changed to the run of the mill Heaven and Earth stuff that doesn't work.)
Others pooled together to buy a Starbucks card with enough credit for one drink so that I could grade their papers there (this after spotting me at a Starbucks grading away furiously). All much appreciated and remembered after all these years.
That's the advantage of teaching the older bunch; they remember funny things and have enough freedom to go out and get what they want for their teachers. 8 year old Jordan has, however, very observantly commented her form teacher loves Hello Kitty and that we should buy all her gym coaches bubble tea because they, like Mommy (*guilty here*), drink bubble tea all the time. (Since MacD's doesn't do it for me anymore!)
Disclaimer: Note that all opinions are mine and are not endorsed by schools of any kind!