Okay, I think classic Harley was absolutely wonderful (particularly the mainstream version, where she's less ditzy) and was, naturally, saddened when DC decided to throw away all that mythology and, especially, her relationship with Poison Ivy, which had just been developing rather interestingly, and go for the grunge whore look.
So, I decided to give Harley and Ivy's relationship a nice conclusion, bringing their story together to a satisfying close, so we know they'll be happy, regardless of whatever happens to the new versions. It's a reasonably funny little story, I hope:
Oh yes, and be warned that as this happens outside of the existing continuity, I did take the liberty of some irreversible plot twists. But it's all light-hearted.