Always have a guide or a ruler whenever you want to cut a straight line.
Roll tightly, especially if you want the beads to last. Try to avoid having space between the layers.
Color the tip of the triangle red and then alternate 1-inch (2. 5cm) strips of orange and red marker down the outside edges; this would create a bead with a red center surrounded by orange and red stripes. Color the tip of the triangle black, move down an inch, draw 1-inch (2. 5cm) black strips on either outside edge, move down an inch, and repeat; this would create a zebra-striped bead with a black center. Do not use washable markers, especially if you plan to glaze your beads; the colors will run.