I think - Contrary to popular belief - that Daley Blind would be an excellent signing for Barcelona. This is my reason:
First, he is a very hard worker, something I think they lack in their squad.
Second, he could fill the role left by Abidal. Currently Barcelona are playing with 2 very attacking fullbacks in Dani Alves (or Montoya) and Jordi Alba. Abidal used to be the more defensively incline of the two fullbacks in what was their best period. They need a player like that. Blind has shown in this world cup that he is very capable to fill in as the left sided centre back in a 3 defender system. Blind could be that auxiliary left back/centre-half for Barcelona that Abidal used to be. He is a ball player and he still has room to grow his game.
Although I believe 22m is too much for Blind, he could be an ideal signing for barcelona, especially as I think they lack squad depth, and I don't particularly rate Jordi Alba.