Portfolio Press is a simple free portfolio theme that will turn your website into a portfolio site. You can try it out and if you like it, upgrade to the pro version.
Portfolio sites are a way to display your artwork/designs/products in a grid format that makes it easy for the viewer to see your work.
One thing I like about this theme, is the designer has included a great video on how to set it up the pro version of the site:
If you would like to see other themes from Devin Price, just go to: http://wptheming.com/