Change the Appearance
There are lots of different themes that people have developed that you can use to change the look and feel of your blog.
Click on Appearance/Theme to make a change.
If you are using the Kubrick (default) theme, you can customize the fonts, change the color or upload a custom image for the header.
You can also preview other themes and if you find one you like you simply click on the "Activate" link.
Some very nicely designed themes are the twenty series. You can set a search filter to just show these by typing in "twenty" in the filter search box.