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
This nursery's motif may be a little dated, but love this idea of a very flat, simple mural as a backdrop. Even if I copied this exact mural, I'd definitely lighten things up - after all, it's for a sweet little baby.