Ok.. I've had a first stab at it. However..
Mike, can you make a slight modification to the banner such that it fades out to the final purple/blue color on the right a little quicker (closer to the 'T' in hat) and accordingly make the image a little narrower with less dead space on the right (maybe cut the dead space after the 'T' by 30-50%). Make sure to use the exact same purple/blue color that you have on the absolute right side of the image now so that it blends perfectly with the image I have behind the search box.
The reason I suggest doing this is that currently there is an undesirable visual artifact when you narrow the browser window down past a certain point. I'd like to get that threshold a little narrower.
If you do this, could you grab the revised banner from the forum header and work on that so that I don't have to redo the lefthand border.
I think it looks pretty good anyway.
