I am obviously that person that always has way too many writing utensils to keep track of, so it's always good for me to have another way to keep up with them. This pen roll-up is a fairly quick sewing project that you can alter to fit whatever utensils you need to store.
contrasting fabrics (I used vintage upholstery fabric and canvas because of their thickness)
trim/yarn/ribbon (long enough to wrap around the roll a few times)
button (one with a shank works best here)
note: I didn't make a pattern for this. Instead I laid out what pens I planned to use and estimated what size the roll would need to be to hold those pens.
note: if you do the steps in this order, the stitching from attaching the pocket will be exposed on the back of the roll-up - I did it this way because I like exposed stitching. If you want your stitches hidden, sew the pen pocket and slots onto one of the main pieces, then sew the two main pieces together. That way your stitches will be hidden inside when you turn it right-side-out.