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
I sent this to my teacher friend. A website that has simple alphabet print outs, upper and lower case. they can be as small as a page or as big 16 pages each. All depends on your selection. And they are big enough for you to let your students draw in them
Also have a tub of objects on table and do not have pictures of A objects below so they find the right items Alphabet play dough mats. Easy for beginning kindergarten because the letters on mat look like real play dough "snakes".