Why, maybe because we can!
It is always advantageous to try different approaches to all our ikebana especially in a lesson format where we can get support from Sensei and other class members. Often in these situations we discover new ideas, designs, methods etc.
A saying I think that is so appropriate not only to ikebana but maybe life in general: “man cannot discover new oceans unless he has the courage to lose sight of the shore” (Andre Gide). To put that practice into ikebana terms, why not try ‘tried and true’ designs and arrangements with totally different materials. Today we used ‘unconventional materials’ in Miniature Arrangements and the ideas flowed freely transpiring into great results