WordPress Theme: Durable
Durable puts site users in control of page colors, allowing them to create their own personal themes for the site. Each element of the page is editable in real time; the user can select the colors for backgrounds, text and links.
Administrators of the site can go a little further. Their color choices can either be saved as a personal theme, or saved as the siteâ€™s new theme so that all users will see their color selections.
Find out more details, as well as trying out the demo, and of course downloading the theme at CssDev.