I'm feeling short on inspiration. How much do others plan/prepare for daycare?

I've got a 13mo, 16mo, 3yo and 4yo full time, and a 2yo one day a week. I'd like to step up my game. I have a montessori set up, so except for our routine (food, outside time, etc) they just play what they want. Could any of you share what you have planned for the coming week? Does anyone use monthly or weekly themes?