Stephan Pigeon and I both have something in common. Even before and now when I don't have ear plugs on me and the DJ\Band is playing stupidly too loud that wadded toilet paper is the perfect hearing protection.
Take a look Stephan's review
Note: Make sure to round off the edge of the wad before placing in the ear. You don't want bits breaking off and going into your canal.
Canned Geek completed an awesome review of ER-20s and provided a tool to tell the difference between foamies and high fidelity.
I love the fact they tried them out with the Flaming Lips one of my favorite bands of all time.