Charcoal and kneaded eraser. An ashcan-style sketch inspired by the Alice in wonderland books. (The title is a reference to the song "White Rabbit" by Jefferson Airplane, also inspired by the books)
I love working in charcoal because its so tricky; can't even look at the stuff too hard without smudging it, and it never completely erases, so its a great way to practice controlled blending, and for doing totally spontaneous stuff like this piece.