This ‘retro’ cane is popular – it looks great and it’s not as difficult as it looks, but you do need an extruder.  The key to the look is the shape of the die you use in your extruder and your color scheme.   As long as you stack a range of colors into the extruder, the design just happens. I extruded through a square – but I would imagine it would work well with other shapes such as triangle and hexagon.   See Bettina Welker’s lovely cane made with the small circle shape.