I got inspiration for this trade from one of Matt's posts.
The idea is that Houston (even though they aren't admitting it) would most likely want to move both Asik and Lin.
How about a trade like this:
Toronto: Lin, Motiejunas, Houston's 2016 pick.
Boston: Lowry, Asik, Houston's 2014 pick.
Houston: Rondo, Gray*
You could swap Gray for Novak but that deal would have to be done after Sept 10th.
Houston gets another all-star to help create a "big 3" with Howard and Harden and can get a backup center or a stretch 4. Boston continues the rebuild by getting an expiring contract in Lowry and a starting caliber center (which they don't have). They also get another 2014 draft pick. Toronto gets a prospect in Motejunas who should have some chemistry with Jonas plus Lin who is not as good as Lowry but gets to play with his best friend in Fields. They also get an additional pick as well from Houston.
Toronto probably doesn't change much in terms of the standings (although arguably Lin would create less wins than Lowry) but they get another prospect and a pick to add to their roster (both things that MU would love to have I would imagine).