Since no-one has yet mentioned the connection, I will, because throwing a monkey wrench in the works is something I do on occasion.
The four horses are described as being white, red, black and green (and I would have to agree with Willie: green means green). Consider the colours on the flags of the Islamic nations. For the middle-Eastern nations, you will find some combination of white, red, black and green. I will give credit for this idea to Walid Shoebat, and I'll let you draw your own conclusions.