Kosmic Kreations Pen Blank - Sierra/Virage #25AKosmic Kreations Pen Blank Sierra Virage #25A. Marbling is the art of putting multi colored swirled or stone like patterns on various materials with paints and inks. An ancient art form, it can trace its roots back to 11th century Persia. Exotics is excited to bring these new blanks and this ancient art form to the new art of pen turning! These beautiful blanks are made with special opaque and semi transparent paints that have applied to the pen tube