This may or may not interest you depending on your interest in flinging different coloured jewels about - Bejeweled 3 is the latest On The House title available on Origin.
That's the whole game for free with no caveats, not the Game Time promotion where you get a certain amount of playtime which slowly runs down.
Origin gets a lot of stick (rightly), but the On The House deal is one of the things it's done right. I've being playing Wing Commander 3, which I got from the promotion, and I've discovered the simple joys of flying about with a giant lion in space. Never would have picked it up normally.
Okay so maybe Bejeweled 3 isn't quite as exciting, but you can't have it all. You've got until October 28 to grab it before the offer runs out.