I don't know if I just had a personal disconnect with Shannon Doherty, but I much preferred the show when the third sister was swapped out.

I also loved any episode about Cole. I like Dark Wyatt, Excalibur Piper, and the evil Charmed sisters.

I actually wrote a fanfic (wait no, I didn't). In my head, I designed a fanart of Prudence dressed royally on a throne lifted via telekinesis; Phoebe levitating in red leather; Paige in white orbing upward, and Piper in black wielding excalibur (looking kind of like Paine from FF). The idea is inspired by my desire to see this setup in action but I could not articulate a decent plot to excuse it. I once tried to get black orb to draw this but he had a lot on his plate and never got around to it.

I've also tried to hand-waive a crossover into Supernatural (and the Buffyverse), but fanservice is as fanservice does.