We bought some postcards which are of personal interest to us and I wanted to make a frame to display them. The difference is that I wanted the backs of the cards to be visible if the frame is taken off the wall so it's a double-sided frame.
I'm not a huge fan of splines on frames, but as this frame might get handled a bit more than usual, I decided the added strength was important.
The only snag is that there's no way to get into the frame so if a card slips I'm going to have to get the saw out...