Celtics in: Jeff Foster, Louis Williams
Celtics out: Brian Scalabrine, Delonte West, Tony Allen

Sixers in: Jamaal Tinsley, Brian Scalabrine, Tony Allen
Sixers out: Kyle Korver, Kevin Ollie, Louis Williams

Pacers in: Kyle Korver, Kevin Ollie, Delonte West
Pacers out: Jeff Foster, Jamaal Tinsley

The principals are Korver, West, Tinsley, and Foster.

Sixers grab a true playmaker to run alongside AI in Tinsley, though they take on his contract and four years of Scalabrine to do it (this is probably why the deal wouldn't happen). Celtics get a big and clear up their PG situation. Pacers get some shooting with Korver and a little long-term salary relief, but have to commit to start West at PG.

I'm not saying I really like this trade, but I was playing around with Trade Machine and this at least seemed plausible.