I've never played Limit Hold'em, so take the following with a grain of salt.
In No Limit, I mostly cold call for implied odds
. If I call with a suited connector or a small/middle pair and I hit big (i.e. a set, a straight, a flush) there's a good chance I'll double up, especially against big pairs like AA or KK.
In Limit Hold'em, I think it's almost impossible to double up in a single hand unless you're really short, so I'd say that cold calling with the aforementioned hands cannot be profitable because they hit too rarely.
However, there are three other hands that I often cold call with:
TT and JJ -> these hands are strong enough to hold on their own. They can take down a pot against AK, AQ and smaller pairs without making a set.
AK -> I very rarely reraise with this hand, I much prefer to see a flop. If I hit the Ace or the King, the hand is almost always good, and if my opponent has JJ, QQ, AQ or similar you can even take a good chunk of money off of him.