Until someone releases a program to mod the galaxy (hint hint, Aaron) I don't think you're going to see any new ones for quite some time. The data files are enormous, and tedious to mod with a text editor.
I've already copmpleted most of a graphics overhaul for my mod, but I see little point in continuing. I just don't have the time to create the mod I want to make. WE NEED MORE MODDING TOOLS.