I've been meaning to update it again. *sigh* I'm more than happy to seek ideas, but there are some basics that need to remain to provide consistency for the site over the years and banners. Primarily, the image(s) on the left need to remain. I'm open to other fonts for "BeardedDragon.org" but will be reasonably critical of the choice and think about how I like the look overall with the site. Mostly, we've used this font, but on occasion have had a different font thrown in. The main area open for "messing around with", is the right side background. You can add foreground, change up font color (or font), etc.
To see some of the past ones, check out this link:
http://www.beardeddragon.org/bannerHistory/
I haven't updated it to have many of the ones after October 2006, but that gives an idea of some of the changes/variety we've had.
The banner image is actually rectangular with hard corners. The curved corners is done through the page display, so no need to try and "create" that. The right side should face to black to allow for more flexible browser sizing and still look like it belongs. I can even handle the blending of things with the left-most images and the animated GIF part. And I'm sure that I have a Photoshop starting point if that's helpful for anyone to use who wants to come up with an idea in Photoshop.
Cheers! And thanks for the interest in helping out with ideas!
-Alex