As far as a matching color, about any good powder coating company with have access to about any color you can think, including flo-green. If you want something that is going to last, powder coating is probably your best bet. Mine was done about 10 yrs. ago and still looks great. Just remember to put bolts in all of the threads, or you will probably have to retap them. (i found out after it was too late)
And for dough906, his custom painted K5 looks SICK!