SharePoint Skins
Many organizations or projects can live with the ready for business look and feel of the 20 existing SharePoint themes found under the Site Settings>Themes area of your WSS 3.0 site
If you want to customize the look and feel of your SharePoint sites beyond the simple themes a company named PixelMill has developed a number of SharePoint skins to provide SharePoint users the ability to transform the "out-of-the-box" SharePoint site into a variety of different color schemes and designs.
We have tried their products for WSS 3.0 and are pleased with the results - the instructions are very clear (no special software required) and the whole operation takes about a minute to upload the required files.
Here is a small graphic of a re-skinned SharePoint-based blog site - more screenshots can be found at the link above.
