This is the trade i would like.
Boston gets: Parsons,G. Smith,C. Aldrich and T. Douglas
Boston gives: Pierce (to indiana)
Indiana gets: Paul Pierce
Indiana gives: Granger, Ben Hansbrough
Houston Gets: Granger, barbosa, Wilcox and B. Hansbrough
Houston gives: Parsons, smith, aldrich and douglas
Boston starts the rebuild with two very good young players in Greg Smith and Chandler Parsons (both very good WP/48 consistently) and saves a ton of money (both aldrich and douglas are expiring deals anyway and aren't very good).
Indiana gets a much more legit playoff team without as much injury worry with Granger (pretty much a straight swap for them)
Houston gets a "star" in Granger to pair with Harden, Lin and Asik to form a very respectable starting five still packed with young talent, and get some bench replacements to help make up for their traded players so they can continue to compete.
The only thing that could hold this up is Houston not wanting Granger but all the rumors state they want him.