you have touched upon a number,
I dont know what types of drawing you are rendering but I usually find it helpful to go to a big art store, or craft store; walk down the isles, pick up anything you havent used to render or draw, and, think about how you could make it work, or, buy it bring it home, and play with it. Have you tried photographic manipulations? Also there are a number of colour application processes, involving films, etc.
Yo's experience at RISD might equip him to answer this well.
Good opportunity to be innovative