As announced in this post, wikia has changed all headers to a new design. I made some slight colour adjustments and uploaded the yin yang symbol as our header background, because it was the first thing I could think of that didn't involve photoshopping an image. (I suck at photoshop.) I hope it's at least somewhat acceptable for the time being.
If you want to suggest a better image: header background images have to be 471px x 115px, in jpg, gif or png format, and cannot be lager than 300 kilobytes.
Besides the header image my design options are rather limited with the new header (see this thread).
Edit: And I played around with the logo, but I'm not convinced whether these two images look any better than the ones we are currently using on our main page.