SharePoint 2010 has 20 out of the box site themes and while you can preview them within the browser, this takes a few seconds to render.
Indivisual Images (Click to open full-size)
|Azure ||Berry ||Bittersweet ||Cay|
|Classic ||Construct ||Convention ||Felt|
|Graham ||Grapello ||Laminate ||Mission|
|Modern Rose ||Municipal ||Pinnate ||Ricasso|
|Ricasso ||Summer ||Vantage ||Yoshi|