You might also like this: http://www.instructables.com/id/Easy-certificate-holder/
Step 1: What you need.
2 or more large coat hangers
Heavy guage wire cutters
Pliers (two sets make it easier to bend the Hangers)
tape to wrap ends.
Safety glasses to keep your eyes protected from puncture. <<< Important!
Step 3: The first bends.
Mark the hanger at the half-way point.
from there measure 1.5 inches (two or so more inches might be better)on either side of the half way point and mark them.
Make your first two bends on the two outside points. like the picture.
I made this one 4 inches wide (original was 3 inches wide).