Personally, I've found one of the more stimulating ways of playing in recent times has been to kind of move outside the free improvised area and work with people who are probably improvisers but they have a particular way of working.
“Space has always been the spiritual dimension of architecture. It is not the physical statement of the structure so much as what it contains that moves us.”
“It is not time for mirth and laughter, the cold, gray dawn of the morning after.”