This is obviously very unlikely, and the only reason why I'm writing this is for pure fun. This is just a hypothetical.
If I were Danny Ainge for the day I'd call up Kevin Pritchard (GM for the Pacers) and offer him a deal. I would offer him Jeff Green, Brandon Bass, and Chris Wilcox for Roy Hibbert. I know Jeff Green's supposed to be Paul Pierce's protege or something but I feel they sank in too much money for a guy who may or may not be productive for Boston. They might as well get out while they still can. Chris Wilcox serves two purposes for the Celtics; one, for depth, and two, for trade-bait. Brandon Bass has had a less than impressive preseason, and assuming the Pacers accept, Garnett would start, and Sullinger would run behind him. Bass would just be taking up cap.
Like the idea? Come up with other possible offers/trades.