Start with one "magic" bean taped to the bottom along with an invitation to draw what it would become. Lovely! Reading Jack in the Beanstalk together would be a nice rainy day addition to this project.
Class Messages. This one is for Measurement. You could write messages and sign them from different characters/animals to fit your weekly theme/story...Brown Bear, Pete the Cat, Little Quack, Goldilocks, etc.
I like this hands-on approach to maths; great for those outdoor learners ~ this link opens up to an article on Kindergarten Math but so many of the activities can be adapted to younger children, like the leaf activity pictured here.
Teaching Measurement to Kindergarten and Preschool Children