^Yeah, me too. In fact, I've been saying for the longest time that I've wanted to see a tree/wood type logia. But there's also the problem of whether or not such powers would be too similar to Robin's (which IS capable of creating clones now).....
That being said, I still imagine that a bamboo power would be an extremely effective one. After all, it's got one of the quickest growth rates of any plant in the world in real life (seeing as it's a type of grass and all). With that kind of power, Vergo could literally create his own arsenal in a matter of seconds!