Quote from r4c7
An Idea I have for a corrupted area would be stuff like sponge and end stone, very foreign and ugly compared to other blocks. I guess you could include marble with those, but I would test it out. Lava & water seemed to fit in my small tests, and I think lapis could be a good accent block. Sandstone could also mix in, possibly, but hasn't that been done to death (jk!). I would attempt this idea myself, but my intel card prevents me from using MCedit, and plus I'm too lazy. If anyone actually takes this idea, I'd love credit.
Quote from inferachnid
It's been done. The concept of the nether "seeping" into a regular area is very common, whether it's a jungle, ruins, castle, caves, whatever.
Anyways, it seems Xekaj is back to life. He fiinally released #21 on his calculator thing. And only 19 days late! (jk he had major mcedit issues so I understand).
EDIT: Calendar. Not calculator. It's time for me to go to sleep.
I know that it's been done before.