Minnow imitations. I throw a lot of Clousers, buggers, and the like. Interestingly, I have found recently that they, like pressured trout, seem to be suckers for a small, unweighted streamer trailing a weighted one. When I fish that setup, it's almost always the small, unweighted fly that gets eaten. I find it interesting that even bass, for all their reputation as big bait maulers, sometimes require you to be more "sneaky" to be successful.
Oh, and don't be afraid to shorten up your leaders and use heavy tippet. Bass aren't leader shy (even if they sometimes require some finesse to trigger), and a shorter, stiffer leader is more accurate when chucking stuff into small, weedy targets and won't break if they get you into the weeds.