I saw a report on the artist Richard Prince.He is known for taking other peoples photos, making slight alterations and calling them his own. Currently, he has a big show of work he took from Instagram. He has taken photos he has found on Instagram (all women, I think), added short comments and has blown them up and printed them on large canvases. The images end up being in the range of 3 feet x 4 feet. here is an article from the Washington Post on The Thief:
By the way, his images are for sale for $90,000!