I build a wooden pen collector, using 3mm MDF and a lasercutter.
The design is made using Inkscape: https://inkscape.org/nl/
Lattice hinges are used to make the wood bendable. For this, there exist an inkscape pluggin: http://wiki.lvl1.org/Inkscape_Extension_to_Render_...
Remember to use some sandpaper to remove burned sections of the wood.