it won't be quiet, leaf blowers never are..
might i suggest a modified party-blower design (you know, the irritating things that make a weird noise and unravel to a large length when you blow into them)
fuck me if i know what they are really called,
but considering the problems you'll face with policing the 30 feet of streamers (these WILL get caught and ripped to shreds in a moment) if you had 5 feet of streamer and 20 feet of coiled party-blower whatever, you'd get a nice effect..
"History teaches that all conquerors who have allowed their subject races to carry arms have prepared their own downfall by doing so."
-- Adolph Hitler, April 11 1942.
Adolph hitler supports gun control.. Do you?
Sic Semper Tyrannis.