It should be a quick styling fix. Also if you haven't noticed a lot of streamers are running away from using headers. Headers used to be a great to further brand a streamers stream.http://www.twitch.tv/murkgaming
Inspect with Firebug.
The header image is actually
But it's printing out as 640px by 125px. It's blurring the image and it's becoming a hassle when styling headers for streamers.