Question
what are some examples of a tubular design, according to NGC Handbook rules?

Answer

anthurium

gerberas A tubular design has cylinders as the theme,using tubes and cylindrical forms with the plant materials.Your container- a cylinder,is easy to find or make. Wire or copper tubing can be used to continue the line in a spiral, or coming out as a corkscrew. There are also flowers that mimic the cylinder or tubular form--calla lilies, bee hive ginger, and banksia. Any shape of flower can be paved or used  against your cylinder form to accentuate its shape and line. As long as you keep with the theme , you can get creative with the placement and type of flowers you add. You can even use brightly colored oasis in cylinder shapes...or fold leaves and wrap them into concentric circles .
Have fun with it ..I hope this helps!