I don't know what your daycare is like, but at ours we have a Parent Advisory Council that meets monthly to discuss any issues and changes at the daycare. Then we also have a "room parent" for each room. Anyways, what we are doing is having a potluck lunch one day for all of the teachers and staff of the daycare. Room parents will send a letter to all the parents in their room asking them to bring a dish. The caregivers and staff always love it!
If you can't involve the whole daycare and other parents, maybe you could just bring lunch for your child's room caregivers? Talk to your caregivers about a day so that they won't make other plans for lunch. You could make a casserole or something.