In the video below, this guy uses dissolved styrofom in xylene (I've used regular acetone before, and that works too) but then he uses it as a varnish. Great idea!
To make a wood stain he then mixes it with "cholera", which, I'm guessing is not the word he meant. :) Looks like shoe polish, I'm guessing.
Still, varnish and stain have gotten outrageously expensive of late, so a real "trash-to-treasure" idea, there!