iGoogle is a startpage for many users on the internet. Your daily startpage that show content of your interest. You can customize the type and placement of content on your iGoogle page. Now, you can also customize the look of your iGoogle page with official iGoogle Theme creator.
It was launched a while ago but was down due to unknown reasons. Finally iGoogle Theme creator tool is up and running to create personalized iGoogle themes. Using this, you can upload background image, format title text and description.
Official iGoogle Theme Maker is very basic in its functionality. If you want more advanced theme creator, then checkout 3rd party iGoogle theme creators. If you are too lazy to make themes, then head over to theme gallery or try themes for cause.