See How You Can Personalize Your Blog with Custom Fonts and CSS
To see just how powerful Custom Design is, take a look at this diverse collection of sites that are all using the exact same theme:
These all have a completely different look and feel because each site makes use of the many customization options that the Twenty Eleven theme offers. Adding the Custom Design upgrade, which is compatible with all WordPress.com themes, takes personalization to the next level by allowing you to choose from over 50 gorgeous Typekit fonts to use for your site’s title, headings, and body text.
Additionally, if you’re familiar with CSS, Custom Design enables you to customize your colors, borders, backgrounds, and even the layout of your blog.
Best of all, you can try before you buy. Head to Appearance → Custom Design in your dashboard to test out Custom Design right now.
Find details and CSS resources in the Custom Design support document.
So, how will you customize your blog’s design?