What about this one:
http://espn.go.com/nba/tradeMachine?tradeId=jfnck66Turner, Zeller, Sully to Washington for Porter and Humphries
Washington gets a big upgrades at PF (a big need) in Sully and a nice backup C while replacing Porter with Turner. Plus Zeller an sully are RFA and Turner is a UFA at seasons end. That makes them more flexible in 2016 free agency. They loose thei starting SF though.
Boston gets a young SF who still hase the chance to develop into a really good player. On the other side they take on sallery for next season.
The one thing that doesnt work is that Hollins or Temple need to be cut, both veterans.
or what about:
http://espn.go.com/nba/tradeMachine?tradeId=zdvbad5Turner, Zeller, Sully to Milwaukee for Henson and Bayless
Milwaukee exchanges rim protector Henson for Sully who can stretch the floor much better. He could play alongside Monroe. They get Turner to replace Bayless and a good backup C on top of that. Plus they keep their financial flexibility. Right now they need some sort of changeup.
Celtics get a good young rim protector, a major need, plus a veteran PG who comes of the books at seasons end.
a third thought:
http://espn.go.com/nba/tradeMachine?tradeId=zpdvyevTurner, Zeller, Sully to Sacramento for Casspi and Cauley-Stein
This is kind of a stretch but maybe Sacramento (dysfunctional as they are) continues the tradition to deal away a first round pick a couple of month after they picked the guy. They might like Sully and Turner could replace Casspi (not his 3-point shooting though). They would gain a lot of flexibility in free agency.
Celtics would get an underrated SF and a youg defensiv big.