Indy gives: Tinsley, Foster, and Jax
Indy gets: MoPete and Al Harrington
Toronto gives: MoPete and Humphries
Toronto gets: Josh Childress and Steven Jackson
Atlanta gives: Harrington (S&T) and Josh Childress
Atlanta gets: Tinsley, Foster, and Humphries
Analysis: We get Harrington and MoPete and get rid of our unpopular backcourt. Assuming no other moves (not a given), we'd run JO/Al/Granger/MoPete/AJ. Toronto essentially picks up a young prospect for free at a position where they're extremely needy. Atlanta loses Harrington (who they were going to lose anyway) but adds a decent veteran bigman, a bigman prospect, and a much-needed point guard.
The numbers work, and the logic works (I think) for all three teams.
EDIT: Changed Josh Smith to Josh Childress.