My wife blowing into a usb microphone, making a "fwwwwpt!" sound, but reversed to sound like a blowgun. Recorded for the point-and-click adventure game, "the beard in the mirror. ".
I used the sound of a brush scraping as the source, added the sound you get when you twist a russian doll (already convolved with itself), and this was the result. To me it sounds a little bit like wind.
A fan blowing, set to the highest setting. There's a strong low end presence, interestingly. The recording was made from behind the fan so the air wouldn't blow into the mic directly. Recorded with a zoom h1.