Here is a fun, simple way for preschoolers to practice their letters- ABC Bingo. Below are 4 bingo cards with the ABC's. I would recommend printing them on card stock and putting them in sheet protectors to keep them clean and reusable. The last page has all of the letters of the alphabet that you can cut out. We usually use cheerios or m&m's for our markers. You could easily use scraps of paper as well.
(To save or print, click on a page below, it will take you to the pdf that you can save or print. For personal use only).