I teach in a deprived area...I do appreciate anything but a lovely message in a card really does make me smile.
I once got a bottle of Prosecco, lovely notebook and pack of pens which I thought was lovely!
Parents usually ask what I drink, I once admitted to a parent i was off the wine as was pregnant and she got me a lovely bottle of alcohol free fizz which was sweet!
When I went on maternity leave I got some lovely bits off the parents, little teddies that the children had chose and blankets and outfits.
Always get a glittery wine glass and matching mini bottle... 
When i taught in a very naice area I got Debenhams vouchers, restaurant vouchers, hampers of strawberries and cream..
My hubby loves it when I get chocolate as he tucks in!
I NEVER eat homemade cakes or biscuits, especially after getting some that had a hair baked into it which was sticking out...