In case you don't know - I should probably mention that washi tape is a high quality Japanese-style decorative adhesive paper tape. It's semi transparent and can easily be removed and repositioned.
The ideas for washi tape uses are endless - you can dress up your packaging with it, add it to your scrapbook pages, wrap wooden cutlery with it and the craft project ideas are never ending. PS: I currently have 12 rolls of washi tape :) How many washi tape rolls do you have?