Eggshells as Planters

Found another one to try...I am testing an idea I saw on Pinterest that links back to an article on Apartment Therapy.  Using eggshells as planters to start seeds in.  Looks simple.  I wonder if it really works?  They claim so, but remember I am not great at growing plants indoors.  Trying it with a half dozen eggs.  Planted peppers in them.  We shall see.  Here is the link to the article I looked at.