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
Ideas for DIY color/shape sorting using egg cartons and pattern cards. Perfect for pre-k students, or any student needing help with patterns/one-to-one correspondence! Also good for older kids to "plan out math" for their younger siblings.