you are asking about the form/structure of the pieces. i guess you can listen and actually pay close attention to structured electronic manip./ drone/ambient pieces- say jim o'rourke 's "1 2 3 .." . other than i think you have to come w/ something up on you're own since there aren't any standard formulas
and a tip on another level: w/ a program that allows live input - such as audiomulch, put a cable in the line in, and a cable in the line out. Touching both w/ varying pressure through the effect/modulations set up creates some crazy - and *really* loud so be careful* soundscapes.