I'm not even sure if the money works out here, because I don't know the exact rules for NBA trades, but I see this as pretty beneficial for both teams:
Boston sends: Green, Lee, Sullinger (total around $15m)
Los Angeles sends: Gasol ($19m)
Go easy on me if it doesn't work because of some rule I don't know
We get a much-needed solid big man while still keeping our leadership and younger pieces like Bradley, Rondo, Melo, and Bass. The Lakers get much-needed depth. The Lakers would have to release some players to make this work (if that's possible).
Boston:
Rondo/Barbosa
Bradley/Terry
Pierce/
Free Agent/Joseph
Garnett/Bass/Wilcox
Gasol/Collins/Melo
Los Angeles:
Nash/Blake/Duhon
Bryant/
Lee/Meeks
MWP/
Green/Ebanks
Jamison/
Sullinger/Clark
Howard/Hill/Sacre