This has been around for a while, but it's worth a revisit for anybody who's been thoroughly hooked by the iPhone game sensation (top 10 in charts) Say What You See Music Fest.
Similar to that specific puzzle app, 50 Dark Movies Hidden in a Painting was created for the launch of the dark chocolate version of M&Ms in the US, but is still going strong.
Basically, parts of the painting are cryptic picture clues to famous horror movies, and you have to guess all 50. As it's been around for a bit, there are walkthroughs and spoilers out there in Google-searchable land, but that would be spoiling the, sometimes, hours of fun you can have.
And if you complete that one, Empire magazine also commissioned one for its 20th birthday, with pictures representing 50 different conventional movies (not necessarily horrors).
Find it here: http://www.empireonline.com/crypticcanvas/
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