Bamboo and wooden sticks.
I was going through the Sogetsu textbooks with my ikebana teacher the other day. We were finished earlier than expected, so I got time to do a quick ikebana arrangement as well. It's interesting to see how the textbooks are designed to help develop your creativity and your individual expression. Bamboo is a material with natural straight lines. I've chosen to emphasize the thin diagonal lines by sticking wooden sticks in a contrasting colour through the bamboo stems.
Sorry about the lousy photo quality. I didn't bring my camera so I had to use the iPhone, which didn't turn out that well. Anyway, I hope you can find some inspiration. Let's be playful today!