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
ENVIRONMENTAL PRINT (Print & Word Awareness Activity) - I Spy Letters:: Use real life items and put on a wall. I used to also have kids bring them in and put them in a photo album in the class library.