The basic idea is to take file junk, put it into a blender that outputs everything in its raw binary state, and use that data mashup as the source for something new. Producing the new from the old would be done by passing the mashup through a software application that makes sense of it as a visual / audio feed which can then be presented somewhere before the data is discarded permanently.
This webpage contains an app written by Ryan Westafer that converts binary files into images:
I’ve dropped him a line.
A broad and interesting overview of ‘binary’.