I always think of tractors as yellow. Growing up, my Dad operated Case backhoes for a living for about 6 months, and he let me operate one. I was 8 years old. The memory will never die
Yellow it is for me!
Now if I had grown up in the farming community my wife came from, it would most likely be John Deere green. Also when I think of John Deere tractors I just remember the line in Dumb and Dumber that Jeff Daniels had about his girlfriend writing him a "John Deere Letter". I laughed for a long time on that one and still do!