You have been using Google’s photo album service Picasa Web Albums, now picasa lets you show options during our search. As a part of these options, you can tick the “Creative Commons” link that will only return shareable pictures.
For some queries amount of images will not all too bad either: a CC-only search for the keyword google shows 276,529 pics, according to Picasa. Here a search for Obama returns 43,510 pictures right now. For comparison, you can have
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