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
egg carton, colored beads and homemade pattern cards
Looks like a laminated hand picture and with use of a dry erase marker, create patterns for student to replicate on their hand with hair ties.
Two Preschool Math Activities with Duplo Legos - Frugal Fun For Boys *good too for matching colors.
For Letter S-- Adorable counting snowman game! Helps with number recognition and counting. Another goodie from contrib
Screwing nuts and bolts
Duplo Counting & Tower Matching Busy Bag, Part of 31 Days of Busy Bags & Quiet Time Activities