Combine the layers within photoshop.. Just open all of your renders and copy them to a new transparent document that is the final size of desired siggy..

Once dragged there, you will be able to resize and place each as needed..

At some point, hide the renders, make a border, and a background based on the transparent layer.. (make sure this one is on top of the others in the layers palette or your renders will be 'hidden' behind it)

EDIT- Maybe this can help.. http://browse.deviantart.com/resourc...ature+tutorial If you can't see this, create an account @ deviantart.com..

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