Martha of Trumpetvine Travels has developed specific tastes in art materials, from a specific fountain pen to a style of sketchbook. She rebinds her Moleskine notebooks to replace the paper that comes in them with watercolor paper.
(You can also have a look at a step-by-step demonstration of how she sketches, with details on what paints she uses.)
I’ve never been a painter, but I do like to doodle and write lots of notes. For that, I built my own sketchbook, which you can see at right. Inside is a mix of lots of random sheets of paper. They are bound in a Coptic style, very similar to the way Martha does hers. Check out her detailed instructions on rebinding to give it a try yourself!