This fixed width theme (960px wide) comes with left sidebar, right sidebar and full width page types. On each page there is room for a header image (e.g. slideshow or billboard block), two "featured work" columns above the content and four columns in the footer for display of information (e.g. Twitter feeds, external links). Most of the theme is customizable including link colours, header and footer colours and most other elements.
To replace the header picture, upload a PNG called "header_background.png" to the /images directory of the theme.
You can view the theme in action here: http://solidinc.org/index.php/themes/solid-grey-theme