My two favorite options in the adminpanel:
1) change header image via adminpanel
You can take image from media library too (!!). If the image is too big only the upper left part will be used.
2) The header is splitted into 2 parts. In the right part you can put an image (like written above) or you can put a sidebar plugin there (!!)
I was so fascinated by this theme that I immediatly used it in my blog. This theme combined with a theme switcher like in YellowLeds YL1.5 and it would be perfect.[/url]