Here is a trade I feel is realistic and helps both teams.
Mareesse Speights for Courtney Lee
Memphis needs a back-up SG who can shoot the three and guard SG's like Kobe, Tony Allen has declined this year. Memphis already has Darrel Arthur who is a good back up PF.
Boston gets a real 6'10" player who has a good mid-range jumper to spread floor for rondo and the 15th Highest Rebound Rate in the league.
Yes, I like this trade for Boston, especially with Bradley coming back. But Boston would have to send more to Memphis -- Speights is on a really good contract for a big man (he has 2 years left at about $4.5M or so).