This is one of the simplest things I will ever post. Instead of spending money on an earring holder, you can use objects most people already have in their homes.
Step One: Take out dental floss. Pull out about 3 feet.
Step Two: Tie ends of dental floss around two thumb tacks or pushpins.
Step Three: Hang on wall so floss droops a little bit.
Step Four: Hang earring holders onto floss.