OK, Flickr friends, you know your photos are lovely, but that cluttered Flickr page just doesn't do them justice. Try Blackr.
It's a simple bookmarket for your browser. Find a lovely Flickr pic. Click your bookmarklet, and it surrounds the photo with black, covering all the clutter. There's also an all-white version, as well as the option to show a border.
How do you get back to the photo page? Click your Blackr bookmarklet again.
Hat tip to @Cruciformity.