Credit:
Google has created a template gallery for Sites; when you create a new site, you can now select a template which you can further customize according to your needs. Available templates cover a wide selection of specific needs; you'll find one for schools, weddings, churches, families, clubs, restaurants, projects and more.
Furthermore, the template gallery is public, and anyone can contribute. Given Google's popularity, and the fact that Google Sites is a free service, we expect the gallery to be populated with dozens of great looking templates soon. Directions for adding a template to the gallery are here; you can also see an overview of Google Sites Templates in a video below.