Navigate to the Tumblr blog whose theme you want to copy. Scroll to the bottom of the blog and click the theme name in the footer. The theme name is usually accompanied by the theme author's name.

Click the "Themes" button to pick a new theme for your Tumblr blog. Use the drop-down menu at the top to filter the available options, and click on any theme to see a preview on the right.

But considering Tumblr’s core interface hasn’t changed that much in its decade and a half of existence, the new direction could bring significant changes to the overall dynamics of the platform.

One of our favorite startups of 2009, Posterous, has received a major update…Themes! Up until now, the site has offered just the one clean Posterous theme, and whilst it did the job, for the ...