I made this washi tape in case you wanted your planner to look like an illuminated manuscript :) 10mm x 10m washi roll with the days of the week in illuminated letters, with gold foil.
Washi tape is a semi-transparent decorative tape that is made from biodegradable Japanese rice paper. It's a temporary tape that doesn't leave residue when removed, which makes it excellent for journaling, scrapbooking, and painting.
