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
If the whole gang missed the costume memo, grab a couple of floppy beanies and colored khaki pants and be the seven dwarfs. Don't forget to designate a Snow White, though, or you'll just look like old hipsters.