I have a racing green Peterson in the B5 shape. The only downside to the green Petes is that the colour will oxidize if left in sunlight. Eventually it will turn a golden yellow.
I've seen a few Green stained pipes and everyone (several were Pete's) turned a sort of dirty yellowish brown a few years after steady smoking. They don't stay that pretty green forever. Doesn't change the excellent smoking that Pete will probably provide, just the looks of it :twisted: