Rods and brushes, help, but really good guys can rip it at low volumes.
Like someone above mentioned, we got a gig that needed small sound, in a small space. We measured the playing area, taped it out on the floor at practice, and chucked stuff out until we fit in the space. I think we even built a speaker tower out of nice lumber to hold a couple speaks in the available floor space.
Then we went to work on getting the sound right at low levels. Think tiny wine bar, happy hour, lots of folks looking to drink and gab.
I have to say practicing at that volume was NICE! It took some getting used to, but very nice. Relaxed, easy, you could talk to each other over the music.
The bar owner loved it. We got a monthly gig. From those we got more lucrative gigs at wineries, private parties and small resturants and bars. Lowering the volume has opened the doors. There's always going to be places to play louder. That's what PA support is for.
We carry less stuff, set up is a breeze, less than 1/2 hour, we could fit everything and everybody into one full size pick up.
Its pretty cool to have the owner or hostess come up and say, "you guys can be a little louder, once the food service slows down, but this is great!"