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
Clothespins on Hangers to practice alphabetical order (leave out some letters? write words on clothes pins? Lots could be done with this idea. Order clothespin numbers on a separate hanger that looks like a number line.
Make a nose wiping station. Set up a mirror, shelf, tissues and a trash can. Present how to blow your nose. The kids can look I the mirror, practice, and see how to wipe their noses. Possibly the best daycare idea EVER!
Cozy reading nook a teacher created with a refrigerator box and floor pillows. I think this idea could be built upon to create an inexpensive Cozy Reading Nook for an apartment that could be altered to appear legitimate.