1. Navigate to iGoogle.com. Click the 'Sign In' link and enter your Google account information to display the main page of iGoogle. If you do not have a Google account, click 'Create an Account Now' and follow the instructions to create an account.
2. Click the 'Change Theme From [Name of Theme]' link in the lower-right corner of the search area. The window will expand to show preview images of the different themes that are available.
3. Click the field next to the 'Search Themes' button and type a search term to search for a theme with a specific color or style. Click the button to search.
4. Click the 'Add It Now' button below a theme's picture to begin using that theme.