Photo editing - Photoshop file

Hi there, i require someone to edit a simple photo for me. Its a flat layered psd, i just need the background extended whilst keeping the main elements in the same place. I need it in A4 please with the christmas elements in the middle. I will need the resulting file as a layered psd so i can see exactly how it was constructed. If possible too, i require the entire background to be editable as i may wish to change the colour or even add a new background altogether whilst keeping the christmas elements the same The winner will need to work on this immediately and provide the results in a few hours max Thanks