Firstly, sorry for the huge image, but in order to see the differences it needs to be full size
I now have a new method of blowing up the 320x256 Scene GFX/Art, example below:-
Left is the newest method and I think this is going to look quite well when printed. Not sure if it's viable with everything out there, but certainly the ones I have tried so far it works pretty well.
From an image of 320x256px to 2240x1792px I think it's done a damn good job and better than anything else I have tried, by a huge margin.