Realistically I think there is only one location we could send KG and that is to the Clippers. I'm not too interested in Bledsoe or Jordan, but I think if a third team is involved they could be the trading chips that net the Celtics a great return:
Boston receive:
Demarcus Cousins, Isaiah Thomas and John Salmons
Clippers receive:
Kevin Garnett, Fab Melo, Jordan Crawford, 2013 first from Celtics
Kings Receive:
Eric Bledsoe, Deandre Jordan
OR
Boston receive:
Cousins, Caron Butler, Isaiah Thomas
Clippers receive:
KG
Kings receive:
Bledsoe, Fab Melo, Clippers 2013 and 2014first rounders and Celtics 2013 first rounder.
The Celtics move KG for a 20/10 guy in Cousins who comes with baggage, but thats the only reason he's available anyway. Along with Cousins they bring in a young promising pg to help run the point until Rondo is back (would also take Jimmer instead). Plus salary filler in Salmons or Butler depending on the scenario. Adding DMC nets the Celtics the inside presence they've been without for far too long and gets them much younger.
Adding KG makes the Clips one of the most dangerous teams in the West. I think if KG picked up the phone and told Chris Paul that he wanted to play together and win a championship, Paul would make that deal get done. This year they balked at moving Deandre Jordan, but I think they are going to really feel the impact of his limitations come the playoffs when he can't even be on the floor in the fourth quarter and will be willing to deal his 10m contract. Sweetening the deal with Melo, Crawford and pick should put it over the top (I even think the pick might be too much). Otherwise, if they are still intent on keeping Jordan, they should be willing to include their next 2 first, which should be late picks anyway, in order to bring in KG.
The Kings have considered moving Cousins for much less on several occasions. This is a solid return for DMC. With Bledsoe and Jordan as their new C/PG combo they've got a decent lineup already. Add in their lottery pick and they are a good young team. If they don't get Jordan, picking up 3 firsts is a nice consolation prize, especially since they're so cheap and they get their PG of the future.
Other options I would consider: flipping Bledsoe in a sign and trade (if the Celtics are far enough under the apron to do so) for Millsap or Jefferson and keeping the picks from LA or KG straight up to the Spurs for a package involving Kawhi Leonard.