I also do not take credit for the idea, as I saw it on a post on another android forum (linked from the white evo with black battery cover thread in the evo accessory forum).
Either way, just wanted to post some decent quality pics of how well this can turn out. I actually took the pics with my dads evo
What I did was take the battery cover off, and mask over the holes of the phone (don't want any scraps getting into anything, this is a messy project).
Then take a sharp razor blade, and start scraping away at the paint. Don't try to cut into it, rather pull the blade along the edge of the phone.
Start at the bottom so you can get the hang of it (and its less noticeable if you mess up).
I took my time on this, took about 30-45 minutes but I got all the edges and corners perfect.
Be careful around the headphone jack, this was the hardest part for me.