I'm using a 2560x1600 display, and every time I try to resize the images, they become crushed horizontally. Any chance that you could possibly resize the theme for 2560x1600 and use the ext3 image that censor supplied with it instead of the one supplied in the OP? It would be a tremendous help.
As this great theme doesn't use a background image, it should just work great with the graphics the size they are. All you need to do is edit the theme.plist and change the following four key/strings to match your resolution:
The theme should now work for you. But if you want to make the devices bigger then you just need to use the iResizer app that I link to in the Resizing Themes
guide and resize the width & height for the required device images equally at I guess 133%. Then the images won't be out of proportion.
I am trying to get you to do this yourself and learn the process, as if I do it for you, then what will you do when you want to try another theme?