Garp,

You seem to have a classic issue but since you have NITDroid installed its even simpler to resolve it.

Download base.zip and blanco.zip from my db and extract them in NITDroid... You need to replace your system's base and blanco folders with those 2 clean base and blanco folders...

So just get a file manager in NITDroid and do so; the path you want to replace in is /usr/share/themes/ but since its NITDroid i think it will have some path before the /usr/share/themes/ path so explore a bit and resolve it