Your green cart and orange tractor reminds me of my orange tractor and green mower (JD 720 MoCo), my red bailer (NH785 round bailer), (NH 67 square bailer), my off red rake (Giehl Gyro rake) and my red (model 30 International steel wheel crimper).
Color isn't important when it comes to an implement doing what you want it to. Actually, I'm color blind in as much as tractors go too. I have an orange one and a red and silver one. Someday, I'll have a blue one too.