Afterburner is the fastest Drupal theme ever and is completely free. The theme balances speed and search engine optimisation with a full feature set. The theme is based on the standard SEO layout used in club themes, and is therefore fully dynamic and collapsible.
An assortment of 8 preset styles, both light and dark also accompany the template.

Bueno is a clean, minimalistic design which just oozes sophistication in both it’s typography & structure. Stripped of all fancy design elements; the reader’s focus should be on the great content that you produce. Bueno is perfect for the regular (and not-so-regular) blogger. Get it for free now!

Type: Drupal template Author: Modlin Downloads: 1

SandTiger is a bright and cheery theme, with colors reminiscent of a popular fast food chain – but the red and yellow hasn’t seemed to hurt them in the least.
The XHTML validates to Strict, and it’s been tested with Firefox 2/3, IE, Safari and Opera.  Those with some CSS know-how might not find it too hard to tweak, either.

This very clean web2.0 theme is a generic theme that can be used for many different websites. The theme is predominantly white with red accents and a green subheader, though using theme options you can easily loose the subheader. Conform the GPL license terms you may use this theme for commercial and non-commercial sites without any limitations.

Pixelgreen is a simple design, it’s clean, uses light colors, and is very easy on the eyes. This theme is based on the identically named template by styleshout.com.

Amity Island is a fixed width theme with collapsible right and left sidebars, six user regions and one level of Suckerfish dropdowns. We’ve included a Pngfix, too, for transparency support in IE6. Currently it’s only compatible with 5.x.

Marinelli is a 3 column, tableless layout theme with a wide image banner and a "top-tabbed" primary-links system.

Admire series is a wide (around 996px) and fixed width theme for those who are looking for high quality, clean and web2.0 style theme for their Drupal CMS.