Tombow Fudenosuke Brush Pens come in a 2-pack for [amazon_link asins=’B01M71S9DU’ template=’PriceLink’ store=’boingboing’ marketplace=’US’ link_id=’1909c73f-5c54-4920-9b9a-77ccce854b7e’] on Amazon. They look like pens, but instead of a nib they have a brush, which allows you to draw lines of varying widths. They’re a lot of fun to use.