In case this passed your radar (like me) you may want to check out Similar Images from Google Labs. You can narrow your results by image size and by content (news, faces, clip art, line drawings, photos). I did a search for yoga and then in the results clicked on the “Similar images” link for a pose on a beach and a pose in a studio and sure enough the results matched pretty well. Of course the results are not always perfect, but can be a great source of unintentional humor.