Is there any limit on the size of the banner (i.e. does it have to be the same size as your current one)? if not... this is what i threw together tonight.
I realize the colors on the font for your name are different for the avatar vs. banner. the color can be changed on either to match the other (though I'm really liking the black with white stroke on the banner). anyway, i was going for a definite "widescreen" theatrical look with the banner, and the detail & size of the image limited it to a certain amount resizing---down to 340x110, like you have now, would have suffered from a significant loss of detail.
while the work could be considered semi-tedious, it only took me 30-45 mins to whip these up. so... if you have any ideas about what to do or how to improve on them (i.e. something artsy with an effect on the background or special filtration), please let me know! i have a degree in the graphic arts world, and work in a related field (desktop publishing/digital pre-press), which means I'm less of an idea man... and much more suited to implementation. that being said, i like what i put down so far... i hope you approve. ;)
edit: added some alternates on the font (white) for the banner---the one with black font, and the ones that say PROCESSED, all have gradient layer blended in and curve adjustments made. the others did not go through with this processing, by accident, but rather than toss them aside, i figured you could decide if you preferred them.

PROCESSED:
PROCESSED:

PROCESSED (BIG FONT):
