Have fun @ http://draft.blogger.com/
Taken from here.
(If you’ve never been there before, Blogger in Draft is just like regular Blogger, except with new, in-development features like this one.) Click on your blog’s “Layout” link to go to the Layout tab. The link to the Template Designer is at the end of the row of sub-tabs.
You can use the live preview to see your new template without affecting your blog. When you find a new look that you’re happy with, just click the “Apply to Blog” button to publish it to the world. Note: You can backup your existing template ahead of time by going to Layout > Edit HTML. We recommend this if you have a customized blog design that you might want to go back to.
Classic template blogs: If you have a “Template” link or tab instead of “Layout,” you’ll first need to switch from Classic to Layouts before you can try out the Template Designer. Go to Classic > Customize Design and follow the instructions there. You’ll need to switch to one of our old templates first, but then you’ll be able to use the Template Designer to pick a new one.
You can use the live preview to see your new template without affecting your blog. When you find a new look that you’re happy with, just click the “Apply to Blog” button to publish it to the world. Note: You can backup your existing template ahead of time by going to Layout > Edit HTML. We recommend this if you have a customized blog design that you might want to go back to.Classic template blogs: If you have a “Template” link or tab instead of “Layout,” you’ll first need to switch from Classic to Layouts before you can try out the Template Designer. Go to Classic > Customize Design and follow the instructions there. You’ll need to switch to one of our old templates first, but then you’ll be able to use the Template Designer to pick a new one.
I've done mine with Blog with YAN. Whats yours?
