Larger top water flies are fun for sure, you might even have some luck with it still this time of year. There will be more responces so I'll keep it short....try a (tan) hummpy or even a sneaky-peet, others that have floating or water fluting action will work great too.
I've found that bass will hit most trout flies in the right circumstances. I've caught them on buggers, muddlers, Dahlburgh Divers, Mickey Finns and even various nymphs and most streamers. Best by far though I find is something chunky that causes a commotion in the water, so muddlers with a largish head or Dahlburghs often do the trick for me.