Google for bamboo art. You will get thousands of ideas !
Pencil cup? A gold plated pencil cup made with bamboo? Use your imagination.
Yes, make a walking stick, use it a lot, then become famous and die at which point it's valuable.
You can make a ton of stuff with bamboo, but it's only valuable if someone wants it.Fishing poles, picnic tables, cups for tropical drinks(line the inside), really dangerous rockets, chopsticks, pipe, sushi rolling mat, and lots of other stuff I'm sure.You can also split the bamboo and use it to cover a piece of old furniture for a tropical feel.As for how to do those things I've not a clue. make an i'ble when you figure one out.
maybe make something like a sword.
By valuable you mean monitory value? or worthwhile?Make a pencil case - jewellery box, jewellery, pens pencils, see to the right >>>>