We will be rolling out the fresh features to the entire Flickr audience in the coming weeks, but why wait? The new photo experience is available for signed-in members to preview now. To opt-in, visit any photo page and follow the directions on top of the image.
—Josh Nguyen, A New Photo Experience: Your Photos, Happier on Flickr Blog.
Took them years to add a 'view on black' option — well, better late than never.