I buy cases of MaMa noodles and put them in the break room for the staff to take home. Every Thai family can use MaMa, and I can spend as much or as little as I want to give. A dozen cases is about 3k baht so it's easy to feel like a big shot.
We have 20+ staff in the building. Some are more directly helpful than others based on their job role, but I'd rather thank the team than have anyone feel left out. I tip through the year for help I request.