If there are antes in play I limp my whole playing range in tournaments. Not sure if it's ideal, but I like it because you're gonna get a lot of cheap flops for free and the pot isn't too bloated while you're out of position. Also, you usually get a decent price to call if the BB raises you.
If I'm up against a weak BB I'll probably even limp hands like Q4o, 72s etc. Against a more aggressive BB I'll tighten up a bit.
If you get raised your options are open again: limp-folding is fine with the bottom of your range, limp-calling is fine with playable hands and you can also elect to limp-raise with both monsters and bluffs.
Not saying this is an optimal strategy as I think basically no one has figured out SB strategy yet, but for me it works quite well.
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