A modular combination toy and desktop writing accessory apparatus comprising a plurality of structural elements each having at least one nodal connector portion to which a complementary connector portion of another structural, element can be coupled. The structural elements can be assembled into a barrel-like form that is configured with a passageway for carrying a writing component of the invention. The writing component can be a pen, pencil, marker, crayon, eraser or the like. The modular combination toy and writing instrument has multiple functions in playtime as well as in everyday desk-bound activities.