This is another theme that I have been working on over the past several months. It is also my second theme featuring a few customization options. This one gives you the choice of three different header images (with matching side images and background colors).
Vista-Like is a Vista-inspired theme for WordPress version 2.1+ (recommended for 2.3+). It includes Gravatar support down to version 2.1. With three different header images to choose from, you can change the look to fit your taste.
Here are the four styles available as well as a shot of the Theme Options page:
Live Preview: via the WordPress Theme Directory