Where I work if it's your birthday you are expected to provide a morning or afternoon tea (ie cakes) for everyone. This was ok when there were only about 15 of us a few years ago but now there are over 50!
On Pancake Day this year a few people decided to make a pancake breakfast for everyone and we all brought in the toppings, that was cool.
When I went on maternity leave they put on an afernoon tea for me and bought me a whole lot of baby gifts, that was lovely. There is always an afternoon tea when anyone leaves, and a whip round for a present.
Oh and at Xmas we always do Secret Santa.
Pity the boss is such a ... rhymes with banker!