Google has released a layout templates directory for Google Docs (the application suite consisting of Google Documents, Spreadsheets and Presentations), which contains about 309 templates for you to choose as a starting point for your timesheets, resumes, invoices, photo albums or party invitations.
The templates are available in Google Docs Template Gallery, which gives you a quick start towards creating a document, spreadsheet, or presentation. Each template has boilerplate content and preset design styles that are meant to be reused. (...) You can then edit the document, replacing boilerplate text and images with your own,” explains Google.
To get started, go directly to the template gallery or access it from the “New —> From” menu in your document list. Templates that you've recently used can be found here.
While Google doesn't explicitly offer an option to create your own templates, you can save them as regular documents and use File —> Save as new copy (Copy spreadsheet) to create duplicates. If you publish a spreadsheet, append &newcopy to the URL to obtain a template link.