Found a small inexpensive wooden box that seemed perfect for some miniature art supplies. Not sure how functional it will be (a true Pochade box carries all your supplies and allows you to work on the inside of the lid), but I'm giving it a shot!
Just had to carve out a place for the waterbrush to fit.
Those tiny artist trading card blanks fit perfectly in one of the spaces. (you can buy them in packs or cut your own, these are made watercolor paper, and are in individual plastic sleeves)
Added heavier hinges, gave the inside a coating of wax and rubbed some old oil paint and varnish on the outside.