Google blogger provides you with the Template but that is not what you are looking for right? Maybe those templates does not suits your blog or maybe they are own by so many blogs so you wanted a different one. So here is the step by step way of applying your own template to your blog.
1. Download a template of your own. If you dont have a template of your own download them from the following links
2. After downloading a template go to your blog of which you want to apply the template
3. In the lower left corner click on the template
3. Click on the "Backup / Restore" in the upper right corner
4.Choose the template you downloaded
5. Click on the open button and open Your blog to see if the changes are applied