@PaulB There is one sound collage by Beatles in their White Album. I used to listen to these modern stuff quite a lot and a lot of bands. Now the only things that I listen to are Beatles, Scorpions, Floyd, Led Zeppelin, Bach, Mozart, Beethoven and Mahler. Just like a limited palette.
Another way to draw is to pick up a newspaper and pick any photo of a criminal, company executives, business tycoons, sportstars, general people. Focus on values and proportions. Rest will happen all by itself. Draw big.