Seems like a pretty realistic trade, not sure if I'm totally sold on it:
Boston Receives: Lou Williams, Josh Smith, ATL #1
Boston Sends: Paul Pierce, Kevin Garnett
LA Clippers Receives: Kevin Garnett, Paul Pierce
LA Clippers send: DeAndre Jordan, Eric Bledsoe
ATL Receives: DeAndre Jordan, Eric Bledsoe
ATL Sends: Josh Smith, Lou Williams, #1 pick
Clippers window is now. Atlanta gets a Center for Horford and a possible breakout star in Eric Bledsode. Boston gets younger with 2 nice pieces and a pick.
I'm not exactly sure how much more LAC would have to give up to make salaries work but it seems pretty doable.