According to the designer (fullahead.org),

this template is tableless XHTML/CSS that validates as 1.1 strict. It uses relative widths so that it handles browser font +/- without any troubles. The vertical plant image is easy to switch for one of your own, as is the accent colour.

Great for sites about gardens, trees, plants, or anything related to nature.

Click here to see this template in action, with some modification and ideas to include Adsense ads to blend in with the theme.

The designer classify this design as a city themed XHTML Strict 1.0 template. It uses a fluid CSS layout with dark background. The header is a cityscape with some hot air balloons flying over the buildings.

Great for any personal blogs, events, special occasions and cheerful urban forums. Click here to see Lazy Days in action.

Go here to download this open source template: http://www.oswd.org/design/information/id/2839/

This is another good looking CSS template by Dreamlogic. It uses a fixed background to keep the image at the bottom of the screen. Click here to see Cruiser template in action with some Adsense ads placed in different places.

Suggested usage: 

1. sites or blogs about convertible cars 
2. sites or blogs about muscle cars
3. anything about classic cars