Even though they are really just floating blobs of goo, jellyfish are surprisingly beautiful. Currently I'm working on a jellyfish illustration (which I'm quite pleased with so far), and I made this mosaic from some photos I favorited on flickr. Some people even had photos of themselves diving with jellyfish, but that doesn't sound very fun to me. Has anyone ever swam into one? I have, and they're slimy.
None of these are my own photos, to see the actual photos go here, and you'll be able to click on all the links in the description.