How would I count the number of cells of a certain color using grids?

I am so sorry I didn't see this message!!!  :-(

We are working on a product called Wall Pixels :-) It should launch on Kickstarter in a couple weeks. 

So we have to order the correct number and color of pixels, so we needed to count them and then print the sheets.  :-)

*EDIT* Changed the formatting of the resulting string and added support for no-fill items

function getCellColors()
{
    var docRef = app.activeDocument;
    var layers = docRef.layers;
    var swatches = docRef.swatches;
    var resultColors = {};
    var resultString = "";
    //function to get the color of a given cell
    function getColorOfCell(cell)
    {
        var result;
        var color = cell.fillColor;
        if(!cell.filled)
        {
            result = "No Fill";
        }
        else if(color.spot)
        {
            result = color.spot.name;
        }
        else
        {
            //there are a TON of different ways to
            //figure determine what color a process
            //swatch represents. You can customize
            //this however you want. I just chose the
            //easiest way here for demonstration 
            //purposes.
            result = "C: " + color.cyan;
            result += ", M: " + color.magenta;
            result += ", Y: " + color.yellow;
            result += ", K: " + color.black;
        }
        return result;
    }
    //target the objects here. Without seeing your working files, i'm just guessing.
    //i'm assuming that all of the "cells" are on layer 1 and that there is no other artwork
    //on that layer.
    var cells = layers[0].pageItems;
    var curCell, curColor;
    //loop the cells to determine the color of each.
    for(var x=0,len=cells.length;x<len;x++)
    {
        curCell = cells;
        curColor = getColorOfCell(curCell);
        if(!resultColors[curColor])
        {
            resultColors[curColor] = 0;
        }
        resultColors[curColor]++;
    }
    for(var color in resultColors)
    {
        resultString += resultColors[color] + ": " + color + "\n";
    }
    alert("Results:\n" + resultString);
}
getCellColors();