Can we try and keep this on one thread please.
Before I believe you said you knew the first column, which I think was x?
So I think working with your code. If x is the first column then you want to change color in next three columns so you run this.
Call ChangeColor(x+1,100)
Call ChangeColor(x+2,100)
Call ChangeColor(x+3,100)
Where 100 is the number of rows you want to check.