you need more green. John Deere is green and then yellow.
you could do vinyl on the roof, hood, and the rear hatch door.
search Ebay for green vinyl headlight tint, John deere stickers, decals and emblems.
green underbody neon kit, green HIDs or green headlight bulbs. (ebay)
get some chrome altezza tail lights and put green vinyl on them.
just some ideas..