Graphite powder and a 2B pencil on Bristol paper (with an assortment of erasers)
For Perry's Imagination and Visual Literacy class, we did book covers. There was a list to choose from and I chose 'A Brave New World' thinking it was about Chris Columbus sailing the ocean blue.
I learned that it is not about Columbus. Though it does have a bit to do with a man finding himself in foreign territory, and trying to adapt to the extreme differences. It's not a very happy book at all, I chose to depict John the Savage towards the end.
I watched Perry do a fantastic demonstration with Graphite Powder, so I wanted to try it out. Basically you lay the powder onto your paper with a soft brush, then after you have it to the value that you want it, you pick up where you want to with an eraser.
Here's a BBC production from the 80's if you have a spare 3 hours or so