A co-worker turned me to this blog post on the Beautiful Underwater Photography by Alexander Semenov. He’s got some really great underwater macro and wide-angle shots. Check them out:
If you want to see more (all?) of Alexander’s shots you can view his Flickr photo stream: http://www.flickr.com/photos/a_semenov/with/6785671451/. Many of these photos are background worthy!
Also check out the gallery of images he’s got on this website: http://clione.ru/gallery