yes, keep it subtle. keep it 2 colors max. since your car is green, i would stick with black/silver/same color green as your car. or, do stuff polished/chromed. I would not paint anything plastic, and u cannot powdercoat plastic parts just do the metal things.

heres an example of mine. My car is silver, with chrome exhaust tips, polished wheels, and red calipers. the colors of my engine bay are mostly red/black/silver.