The only thing with this is that Boston isn't an organization that signs big name free agents.
Big name free agents either want to get paid or want to play for a winner. For the Celtics to get one, they either have to clear cap space for someone who other teams aren't willing to pay the max for or they need to have a playoff team with cap space (or a near-playoff team such as Houston last season).
The Celtics could spend some picks to create cap space the way Golden State did. Or they could do a sign-and-trade. (Iguodala was a S&T, but only after the Warriors were able to threaten to sign him outright so that the Nuggets had to agree to a deal or get nothing.)
In the summer of 2014, the Celtics can use the expiring contract of Brandon Bass and the non-guaranteed contract of Keith Bogans as trade ballast. In the summer of 2015, they can put together the expiring contracts of Gerald Wallace and Courtney Lee. Combine that with multiple draft picks and a deal is possible.
I don't think Ainge is interested in overpaying certain types of players, so his strategy should be to build a young, winning team with a highly-regarded coach that is perceived as being on the upswing in order to attract a quality free agent. The ideal target is probably a player who has already had his big contract and now is more focused on winning.