London Calling is a really popular single column Tumblr theme with a "lightbox" effect. There’s a white section to the left for all of your content and then a lot of black space filling the rest of the screen. If you don’t want to tweak the CSS yourself then you can change the colours easily in the customise tab. The example above is a screenshot taken from street artist Roa’s Tumblr blog, Roa’s Work Install London Calling for free.
Pinterest has made us all go a little crazy for the grid-like, photo collage look when it comes to blogging. But, if you want the focus to be on your images rather than the way they look together, or you’d just like your words to stand out more, then try out one of these clean and simple Tumblr themes, for no nonsense blogging that won’t make your eyes hurt.