Found an old device I did over a year ago, it's based on something Alan Silvestri did in the "Night At The Museum" score.
Since I did this a while back, the score has a few misplaced dynamic markings and also lacks slur markings for the fills for some reason. I left the mistakes in there just so you can see what not to do:) NotePerformer wasn't available when I composed this so the mp3 is a "real" mock-up instead of the usual NP-output.
As for the actual device it's a call-and-answer between woods/strings (call) and solo clarinet/bassoon/tuba (answer). The solo instruments has freer phrasing and contrasts the rather static rhythms of the combined sections. All this takes place over a pedal (viola tremolo) and ostinato (harp). Again, the harp could be argued to be a pedal as well since it stays on the same note throughout.
The idea behind the device is simple, but that's also what makes it so malleable and useful in the long run. You could come up with countless variations on this simple concept alone, and that's ideally what a good device is, something that can be used in many different contexts.