Here is a great Martha Stewart tip for making your own decorative plate hangers. These are cheaper than the storebought ones, and you can whip up them up in a few minutes for any size plates. You will need 18gauge wire--I used jewelery wire purchased at FiremountainGems.com and wire cutters (floral section or jewelery section of Wal-Mart).
First cut two wires the length of the diameter of your plate. Fold one wire in a V at the half-way point and form a loop with the other at the halfway point. Take the wire ends from the loop and twist them around themselves abut 2 to 3 times. Hook the V into the loop and wrap the wire ends around the top and bottom of plate. Make a little hook at the end of each for a more decorative look. You will hang the plate by the loop. After a little practice these are very easy to make!