Begin by making sure your fabric will cover the letter.
Make Your Own Fun, Fabric Covered Letters
The writing is literally on the wall with these fabric covered letters. Wrapped with a portion of a world map at the front. Your world in your own words. Arrives ready to hang with brackets at the back.$12 each
Fabric Covered Letters - JoAnn | Jo-Ann
I'm sure you guys can come up with your own brilliant ideas. Hope this has been helpful. Let me know if you make some fabric covered letters so I can see!