Could also connect a bunch of locks and put all the keys on a key ring. Lots of pictures of latch, lock, etc ideas for montessori type preschool. This lock one could be made with 2 boards, some o-rings, and some locks from Dollar Store.
ICE THEME Dinosaur eggs ready to be hatched, the children loved this activity (small world dinosaurs, frozen overnight in coloured water in a balloon) they used tools and salt to hatch the Dino babies EYFS
Use clear plastic plates to make a "snow globe" winter scene. The teacher had kids write about "if I were in a snow globe." but I think I'd do a writing exercise more like "What I like about winter." or "What I would do in the snow.