Strips of paper can be rolled and stacked in many configurations. Depending on how wide you cut the strips and how many times you add a layer to the stack, you can end up with barrel or round(ish) beads. The barrel beads (left) are made with scrap paper and covered in magazine images before the next layer is added. The round bead (right) is junk mail.
For the blue pendant, I cut strips from a junk mail flyer. As I added each new layer size, I covered the larger layer with a strip of envelope liner. I have a file folder where I keep my stash of envelope paper.