...the key is to make the music,interesting and forever changing,kind of painting but with sound,to evoke an atmosphere,or mood...
I like to include a generative element or two as well.
I love the sound of Reaktors' Metaphysical Function, I sometimes leave that running while I putter around the house. More interesting than Music For Airports..
Edit: OT a little, but PaulStretch can make "ambient" music out of most anything..http://hypermammut.sourceforge.net/paulstretch/
Yep heard of his work, Austin
I'm also a big fan of Jean Michel Jarre. Two of his albums Oxygene as an example, and Waiting for Cousteau,as another example of atmospheric work
With me,I try and avoid making the kind of music,found in for shopping centers,lifts and airports, too ha,ha
But try to have something,that's interesting and can hold the listeners attention.As an example a sudden cut off the main sound except for a few drips,heavy fx affected breathing,footsteps etc
But sure, anything can be used for ambient work,the genre as we agree is huge