I love noise, it masks my tinnitus. I’ve don’t have a specific preference for the kind of noise source. 
Sometimes I use electromagnetic sensors to pick up signals that we can not hear.
Sometimes I make recordings of end-grooves of crackling vinyl records, with the needle skipping each round of the record.
Sometimes I record noise from erased cassette tapes. The ever changing hiss is like the texture of an empty canvas.
Sometimes I use the noise between stations on an old radio. 
Sometimes I experiment with electronic circuits and crackle boxes.
Sometimes I put a probe on a working analog or digital circuit board.

Noise is pure, it can be shaped in many different ways.
When I improvise on the piano without noise, most of the time I feel uninspired. Improvising piano on a bed of noise has the amazing effect on me: it unlocks a window through which endless inspiration comes is. It continues to amaze me.