I think we all would obviously love him back. However, let's be clear: this isn't a good situation for Pietrus. When healthy, he'd be lucky to be the 11th or 12th man on this roster. So, if he's really set on staying in the NBA for the minimum salary, he's much better served going to a team where he'll actually get a chance to play and earn a better contract for the following year.
And if he just wants money, he's better served going to Europe.
Now, I'd love for him to ignore these things and come back. He'd be an excellent insurance policy and awesome to have in the playoffs as an extra wing player for situations where Bradley, Lee, Pierce, or Green get into foul trouble. But it's not a good situation for a guy looking to get more than minimum contracts the rest of his career.