I love the show Adventure Time, one of my favorite characters is Beemo. This pen/marker holder, it's really simple here is what you will need:
I used a backing to a watercolor paper pack that I used up for my box, any kind of thick cardboard will work.
I cut 3 pieces the size of 3 x 3 1/2 inches
Tape them together to form a box
I cut another piece 3 x 3 inches for the base
I taped it on in inside, and then on the outside for extra support.
Wrap scrapbook paper around the box, and mark where to fold then I used my ruler to bend the paper for a straight edge.
Fold the tabs down.
I cut the corners so it lays down nicely. Use glue to keep them down, I would suggest using a piece of felt the same size as your bottom to protect your desk.
I cut out little pieces of paper and colored with my copics. In hindsight I would have drawn the outline before I glued the shapes on, it would look nicer, the box is awkward to draw on. Now just fill with pens, markers, knitting needles, make-up brushes, it's very sturdy and can hold a lot!