One thing the Cs could do would be to try and use Wallace's expiring contract and pick(s) to trade for a star who is already under contract, and then use that move as enticement for a second guy via free agency. That's essentially what they did in 2007 with Ray Allen, who helped the Cs pitch Garnett on the idea of coming to Boston. (Yes, I realize Garnett was also traded, but you get the point.)
Could this work this time around? If so, who might that first star be? I think it could end up being someone we are not at all thinking about right now, maybe someone with 1-2 years still on his current deal.
They're not stars, but both Eric Gordon and David Lee will probably be available this summer for any team with the cap space to absorb the bulk of their deals without sending much, if anything, back in terms of actual salary.
Gallinari is another guy who's shown the ability to be a quality scorer in this league who I expect to be available for not much.
Hibbert, if he opts in for the final year of his deal, may be up for trade for a relatively small price, again given the ability of the team trading for him to take on most or all of his contract without sending salary back.
I honestly can't think of any names equivalent to Ray Allen circa 2007 that would be available. Keep in mind, too, that the Celts traded a top 5 pick to get Ray. They don't have one of those -- or any asset of comparable value -- this time around.