Blogger has developed another very exciting feature called the Template Designer. With it, you can create custom template designs using an extremely user-friendly interface without having to worry about meddling with HTML code! Yes, that's right, you don't have to go through the Layout -> Edit HTML interface to get another sidebar to your template, or to add a nice background image to your blog or to do many more template tweaks.
This feature is still not released formerly and is now in testing stage in Blogger in Draft. If you log in to draft.blogger.com, and go to the Layout section of your blog, you will see a new sub section called the Template Designer. (see figure below)
From that interface, you get to choose from a set of expert designed templates, manipulate the column layouts with a snap, apply many different background images and also customize the fonts and colors. You get a real-time preview as well, making it easier to experiment.
Go on and try it at Blogger in Draft and I'm sure you will love it!
Even if you have applied any customizations such as three-columns or wider-blogs from The Blogger Guide tutorials, the Template Designer will still work. It will recognize that the template is customized, but still its changes will work.