I looked at your site and really think the banner looks bad. It goes well at the top of this page, because it blends with the Latest Replies thing, but as a stand-alone it looks out of place. So I tried to edit our banner so that it would look better as a stand-alone image, but I couldn't quite get it to blend right, so I started over from scratch. I didn't quite match the font, but it has the same basic look as the one above.
Then I created a new banner from scratch, just with our name, because I think it looks better than my attempt at recreating the previous image.
Finally, I added racing stripes, you know, to make it go faster.
Choose your favorite or make your own. Who designed the banner for MTGDarkness? They clearly have much better photo-editing skills than I.