Another alternative that I'd choose over just stretching the picture is to do something nice with what you have. The possibilities are endless! I made a really simple example (less than 3 minutes) just to show what I mean, but there's so much else that could be done. You could add other photos laying scattered around, or you could put some nice design along with it.

http://i26.:bou::bou::bou::bou::bou::bou::bou::bou::bou::bou::bou::bou:/2z4z1nk.jpg