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
smART Class: Floating on to ___ grade! End of the year project. Would be great for exploring circles or as an extension to a bubble exploration. Also, chalk on black paper can be its own exploration using both dry chalk and chalk dipped in liquid starch.