30 pencil icosahedron
With this 3d printed kit, plus 30 standard-sized hexagonal pencils, you can build an icosahedron-shaped object of about 38 cm or 15 inch in diameter. Use it as a lampshade, or just have it around as a fun and educational object. Fits standard hexagonal (colour) pencils of about 7.0 mm cross-section, measured at the smallest diameter. Use that set of pencils from the bottom of your drawer, get a new set or buy separate pencils of only those colours that you like.