If you're new to the Themes API, here's how we recommend you get started:
iGoogle provides users with a personalized view of the web. You can leverage the themes API and tools to build themes about outer space, cartoons, dogs, or anything you can dream up, helping to further personalize iGoogle. This is your chance to redesign the Google homepage for tens of millions of iGoogle users!
"JR" by Google
The iGoogle Themes API allows you to personalize iGoogle by modifying the page's design. Your theme can modify the header and footer images, text colors, link colors, gadget frames, and more. Your theme can also update the page's design based on time of day. This makes it easy to create a story that unfolds throughout the day, landscapes that change as the sun rises and sets, and abstract images that become more complex. Creating a dynamic theme is as simple as specifying a time with a theme's visual attributes.
Download the themes template to help jump start your development. This is especially useful if you are new to XML.
Share your favorite theme by sharing a tab. Pick your theme and gadgets on your iGoogle page. Then click the menu button next to the tab's name, and select "Share this tab" to send the tab to a friend. The selected theme will automatically be bundled with the tab and its gadgets!
Four designers have created their own iGoogle themes, highlighting various features of the API: