Here is a project I didn't know I wished to undertake until I did it - cwirsing's DDR Machine v2 totally (almost) revamped! You get new, bigger textures, a flatter, more modern screen, colourful speakers, and absolutely no difference in GUID so take the other one out because this is not going to end well if you don't. It's a total replacement of the other's mesh and textures. The functionality is the same, though. I don't know how to fix that.
Download here! Requires University.
Do you like what I do? Then I'd love if you donated. Any amount helps!