Adding color to individual matrix drag and drop boxes

Hi all! I would like to to change the color of each of my individual matrix boxes, but I can't work out how to do it. I've seen another post here that achieves what I want, but using the multiple choice options - I can't work out how to change this code so that it works with the matrix drag and drop boxes.

Here is the code that I am talking about from the referenced post:
var c=["#f9f9f9","#ececec","#ececec","#dfdfdf","#dfdfdf","#d3d3d3","#d3d3d3","#c6c6c6","#c6c6c6","#b9b9b9","#acacac"];
for(var i=0;i<=11;i++){
jQuery("#"+this.questionId+" label.SingleAnswer:eq("+i+")").css("background",c[i]);
}

And here is the question format I am trying to achieve it on:

Any help is really appreciated!