Calming jar-tell child that they need a break and may come back when everything has settled to the bottom - I think I love this idea. Better than a simple time out for temper tantrums. some days I think that I need a calming jar.
Had when i worked in a preschool and kids love them! I would use colored sand instead of white salt. DIY salt tray with alphabet cards. Easy to make and kids have fun smoothing out the salt after correctly making the letter
A cute display in the spring outside the classroom door. you could use this for adjectives and have the students write adjectives that describe them self on the petals or do an addition problem with the petals.