Age old question! Black kicks ass! Go for the BLACK-OUT! I believe they all make black, purple and white, but noone stocks the colors. Try Motosport Outlet. They distribute alot of manufacturer's plastics. Be ready for a lengthy Back order, but they can get it. Let us know how it goes. I would also like some black on the k5. Green is cool too, but I like to notice my bike in a crowd, if you know what I mean.
Check out graphic packages also. My 96 250 is almost blacked out with Skin Industries Vinyl. It is a heavy mil. package that covered shrouds and had a black gripper seat cover. I used black fork guards. You can get black backgrounds for number plates and any front fender will bolt on. They also have rear fender decals that cover 99% of it, and come with a series of "sponsors" and after-market mfg's.