Letter of the week T-shirts
Purchase or collect several cheap white T-shirts. You want them to be big enough to easily fit over a child's clothing . . . adult size small T-shirts are usually the best. Use fabric markers or a permanent marker to draw a giant letter on the front of the T-shirt. Then use fabric paints, craft glue, beads, sequins, ribbons, and other things to decorate the shirt up all fancy. Create a different shirt like this for each letter of the week.
Once you have it, use these T-shirts t with your letter of the week and integrate them into your other classroom activities. For example, you can take turns assigning a different child the privilege of wearing the T-shirt each day, or perhaps award the shirt based on good behavior. Create several privileges the wearer has, such as standing to lead the group in group time, helping the teacher set up lunch, or being first in line for recess. Because it's something the kids will covet, and because it creates a visual image that follows kids around all day, it's a great way to work on alphabet recognition. Kids will pay attention to who has the T-shirt, ask each other what letter it is, and carryon other conversations regarding this activity. It will help them learn their alphabet in no time at all, and works especially well with those kids who normally struggle on letter recognition!