Turns out you can resize the header, with a little effort. I don't know exactly how high you want it, but attached is a PSD of the header at 200px. To change the height adjust the canvas size in photoshop, resize layer 2 accordingly, then move layers 3, 4, and 5 to the bottom of the canvas.
You'll then need to create a 1px wide image from the header to repeat and save it over /images/chromite/gradients/gradient_header.gif.
To center the header image just add text-align: center to the div#header selector in the CSS.
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