New Theme: Nishita
Nishita is a simple, minimally-styled photoblogging theme—now available for WordPress.com blogs. With a choice of dark or light color scheme, the muted design puts all the focus on your photos. Not only is this theme designed for photos, it loves big photos: the default layout is super-wide at 1024 pixels.
Theme options include two layout choices: “Photoblog” at 1024 pixels wide, or “Blog” at 768 pixels wide. For an even more reduced photoblog look, you could change your WordPress.com reading settings to show one post per page, and thus only one image will show at a time on your front page.
This photo-loving theme also uses post thumbnails to show a small version of images on your archive pages. Personalize it with a custom background, header image, and menu.