3 posters over wall edge, how to align them correctly?

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Hey folks,

i know this is not really game art related, nonetheless its still artsy, so i hope someone can help me...

I have my own appartment now and would like to give it my own touch.
Thus i had that crazy idea to make 3 posters which i would like to hang into one corner of my living room.
But how do i align them correctly so that the edges dont look off?

Tools of trade are Photoshop and Max.
Here is a quick visualisation of what i had in mind:


and here are some links to some pictures that go into the same direction like what i had in mind:

http://bast0s.deviantart.com/art/Abstract-48046585?q=boost:popular abstract&qo=4

http://ghost-001-.deviantart.com/art/Abstract-Brushes-12-19870358?q=boost%3Apopular%20abstract&qo=57

http://klm21.deviantart.com/art/abstract-93338763?q=boost%3Apopular%20abstract&qo=62

http://scarart.deviantart.com/art/Space-abstract-47622309?q=boost%3Apopular%20abstract&qo=72

SpeCter

The only thing which comes to my mind is applying the poster textures to a similar corner piece and paint out any irregularities with projection painting or something similar.