Post-Launch debris, or clouds?
I was in Cocoa Beach at this point, I guess an hour or so after it lifted off. Not sure if this was debris, but it looked so cool in person.
Edit: Just read this on CNN.com -
Minutes after launch, Atlantis' contrails formed an intricate and unusual knot in the Florida sky, framed by the colors of sunset and with the bright light of Venus peeking through.
I noticed it an hour later so it probably lost some of the detail, but it was still very cool!