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
123 Homeschool 4 Me has a fun, playful way to introduce alphabet letters to toddlers and preschoolers using kid favorite Lego Duplos. Just print these FREE Duplo Alphabet Mats and use them to teach your child letters and numbers in no time.