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
Sort by color. Just get an old shoe box and make the holes slightly larger than the colored objects. Cover the box with colored paper and clear tape. Inserted dividers inside the box. (the cylinders at the dollar spot in Target.