k2 is a very popular theme for WordPress.

One of the reasons for the popularity of K2 is that it's highly configurable. The look can be modified by simply dropping new styles into the K2 installation styles folder and choosing the new style in the K2 options panel. With the latest version of K2 you can also choose single column, two column or three columns.

You can get K2 at http://getk2.com. Install by unzipping and placing in the themes folder in your WordPress installation.

Once you have K2 installed it's time to add some styles! See some of my styles below. Click the arrow below the image to start the slideshow. Full instructions for use are included in each zip file and there are also instructions on my blog here.