I loved it when lunch was ready for us in a room right by/in the cafeteria. Drop off the kids, grab a free lunch. Chili and/or salad bar with all the fixings was great.
In one school I worked at, we were required to watch our children in the cafeteria while we ate in there at the 'teacher's table.' Getting parents to volunteer to watch the kids so that teachers can have a duty-free lunch is SUCH a gift!
Free snacks at those boring/annoying after-school meetings (drinks and sweets and a salty snack) make the meetings less boring. Don't forget that root-beer or coke floats are a fun treat too! Chex mix can have sweet and salty (m&ms, raisins in there). I taught at two differnt schools in my 5 years of teaching. One school did treats every meeting and one school did absolutely nothing. I really felt appreciated when given a snack. Noone wants to attend those meetings. I felt valued and felt heard when given a snack. ie: like the principal was saying "I know you don't want to be here. I know you have tons to do. Please accept this snack as a token of my appreciation of you being here." Oh and I just remembered that she'd hold a raffle at the beginning of the meeting. If you were there, you could win a prize. If you weren't there on time and your name/number was called, then you don't get the prize. It gave us incentive to be on time. Prizes were anything from soaps, to lotions to candy to a teacher-type gift, to extra paper, to a gift card for $5 to a local food joint. I think you could get local places to donate stuff.
Birthdays were never a big deal for me. Of course, my bday was right at the end of the school year. Maybe a free pizza/take-out would be nice. Teachers don't get to go for lunch specials. So we have to bring our lunch or order from the cafeteria. A burger and fries would even be a treat, if it's hot and if it arrives on time. 10 minutes late and that's 1/3 of her lunch break taken away, and ends up being a pain rather than a gift. (that's why I said that chili or something that stays hot/cold is a great idea).
(btw - I taught elementary - 2nd, 3rd, and 5th grades)
ADDED: For Xmas one year, the principal bought us coffee service. We had one year of free coffee in the break room, plus they also had hot chocolate and tea bags for us too, sugar and cream were replenished daily. It was nice, although the coffee was far from my classroom!