DePo Square is a beautiful, simple WordPress theme that provides Tumblr-like capacity to post photos and videos in the stream of your posts.
Designed by well-known web identity Derek Powazek, DePo Square is a minimalist-looking theme with elegant typography and effective functionality.
To use the theme ala Tumblr, you simply map your categories so as to allow you to use five pre-defined post types — Post (default), Status, Quote, Link, or Photo — and your content will be displayed in a format special to those types.
Just select your category mappings by visiting the “Current Theme Options” under “Appearance.” No CSS or other formatting is necessary.
The theme also has a neat widget space in the top header, allowing site owners to mix navigation with updates from Twitter and Flickr.