Free WordPress Themes
TripWire Magazine has 65+ examples of free WordPress themes that are very useful while experimenting with the design of your site. I like that they categorize the themes for you…so depending upon what problem you are trying to solve you can easily find a theme solution. Some of the themes are more complicated than others, meaning the plug-ins might not be exactly what you need or want so be careful what you choose. As these are portfolio sites I would also recommend choosing a theme that closely matches how you want to be represented and not just something that looks pretty. One of my favorite themes is called Imbalance 2.