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
The Stay-at-Home-Mom Survival Guide: Preschool Activities This is a GREAT site. Stay at home mom or go to school teacher!many clever and easy ways to work with your preschooler and have fun at the same time.