Eek, lots of mods on mine now that I'm counting (though not nearly every mod that's available). The highlights:
Various extra/alternate figures w/ weapons
~90% LEDs w/ LEDOCD
Inside decals (sillyoldelf)
Lit Gandalf Staff (@Hdmike44)
Brass wire habitrail mod (ryan1234)
Balrog whip (PersonX99)
Arcade Upkeep dimming LED backglass thingy
Pinball Refinery POTD mod
Custom Barad-dur lit eye and extra shire grass w/ lighting (by me)
....and lots of other smaller things I didn't list
BTW, thanks to everyone who makes all of these awesome mods.
The only other thing i really want to do to it is install the transparent green pop bumper bodies I've got, but I'm still waiting to get some matching dark green skirts.