A few weeks ago, I ordered a photo poster from QOOP using photos from my Flickr stream.  Before ordering, I measured the Ikea frame I had on hand.  Except - I measured the outside of the frame.  Of course, when the poster arrived (and it looks great!) it was just slightly too large to fit inside the frame.

It’s another trip to the art store for me I’m afraid.  Lesson learned.  Always measure the inside of your frames!