Normally I would get a frame made up to suit the picture, but that takes some time. So what I would do is try to get a surround to cut to size to put around the picture to match to a normal sized frame. Hope that makes sense?
This should be a fairly cheap way of going and will be quick.
Pop into a frame shop and they should be able to show you all the different coloured surrounds and then you can match one to your picture.
Ahh what a pain! I'm guessing all you can find is 50 x 70 frames! Can you crop the picture without losing anything important? The other thing might want to do is get an even bigger frame and get a custom mat made up - but it might not be so obvious that the pic isn't a standard size in a bigger frame.
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