I wanted to let you know that I have changed some of the templates to allow a customizable header image. If you are curious, I used this tutorial from WPMU Tutorials. Now, if you go to Appearance -> Custom Header, you can upload your own header image! This is now on 9 of the free themes, including the popular LivingOS DELTA theme.
Also, be sure to check to see some of the features on the other templates. Some have a alot of great extra features!
Let us know if you have any questions.