Dani wrote: "...you could see that at the right side, you will need to have the shadow included as part of the image." I have not the slightest idea as to what you are talking about here. What shadow? and where can I locate it?
I am not quite convinced with your suggested solution. I will try it out and let you know what I find out later this evening.
Of course you should expect people to replace the default image with their custom made images as they find appropriate. Doing this should not screw up the template design.
The point here is about the symmetry of the template layout. That is really the issue here. Even when the default image was not replaced -- the resulting pages built using the template were not symmetrical, i.e, the edges did not line up they were out of synch.