I don't want to trade Paul Pierce, but if I did, what I would want in return is either a player with All-Star potential or a good draft pick. I would not trade him for spare parts and a first-round pick in the 20s.
One type of team that would trade for Pierce is one that would want to save money by swapping a longer contract for Pierce and giving the Celtics other assets as compensation. The most obvious bad contract on a bad team is Washington's Nene, who is owed $13m each season through 2015-2016.
Washington current has the SF spot held down by Martell Webster, Trevor Ariza, and Cartier Martin, so there is no young player whose development would be blocked by acquiring Pierce. On the other hand, they have young bigs such as Jan Vesaly, Chris Singleton, and Kevin Seraphin on the depth chart behind veterans Nene and Emaka Okafor.
One problem is that the Wizards supposedly love Nene to the point that their untouchable list is him, John Wall, and Bradley Beal. (But then, Chris Broussard tweeted that.) The key, of course, is that the Celtics would have to receive a first-round pick. It would almost certainly be lottery protected, but the hope is that Washington would still suck in a future season when the protection is decreased.
You can try to modify the deal. Maybe the Wizards want to jettison more salary. Would you want to try to work Brandon Bass (or Jason Terry) and Trevor Ariza (if he exercises his reported player option) into the trade?
If this were possible, it would make more sense, from both a win-now and a build-for-the-future trade, than other proposed Pierce trades, such as the Brookynettes' reported offer of Kris Humphries, Marshon Brooks, and a first that was supposedly quickly shot down.