Hi,
How about arrow shafts, blow pipe and darts to shoot out of it.
Those photos look exactly like ordinary river cane (aka reed cane) here. So does the description you gave of it being quite invasive. And usually an attraction for balackbirds.
I've just looked at a YT video about river cane (http://www.youtube.com/watch?v=44EeQCIVo6Q) and it looks different to mine... the mystery goes on!
We're planning on making bug boxes - using plastic tube is a much easier idea though, as my woodworking skills are limited!