Interesting. My team makes/brings in cakes for each other for birthdays. Well, rather, some of the team is so organised they do it. I'm of the "oops, forgot it was my turn to even buy milk/coffee let alone cake club", so luckily, it's not me having to do so, otherwise, no one gets anything!
I sometimes bring sweets, sometimes not. The team are suckers for York Peppermint patties, so if I'm in the US for work/pleasure, I try and pick up a bag or two. I go to a place in Belgium that has the most.amazing.chocolate ever, so I will get shunned if I don't bring back chocolate from there on a work trip. Sometimes, we try and bring back the most bogging sweets we can find. This is always great. I've had a lot of fun trying/eating candied cicadas, chocolate covered worms and strange gummies and sweets coated with black pepper, etc.