I bought a simple green wreath on sale at Michael's for $4. I also bought the decorative sprigs for 50% off. Total price for this project was roughly $10.
I created the "E" out of a prepped white wood letter, Sharpie paint pens, pencil and ruler. I used a 2" ruler to create the diamonds and just filled in with the paint pens. It's secured to the wreath with hot glue.
Simple, quick and easy.