Blog configuration has “Display Skins“ combo with different options. I tried to find in Google samples how each of skins looks, but didn’t succeed. dottextwiki describes how to configure new skin and there is Unofficial .Text Skin Directory for additional skins, but Skin repository with sample previews of standard skins would be handy.
UPDATE: It is quite easy to play with available skins by opening Admin/Options/Configure and choose from “Display Skin” combo-box. I’ve preferred gertrude-blue.css, because it shows content on the left side, making it printer-friendly.