Specifying different colour for each block

I got the below coding from  demo in one site where the image is divided into blocks..

clc;    
close all;  

rgbImage = imread('im9.bmp')
rgbImage=imresize(rgbImage,[256 256]);
imshow(rgbImage);

set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
drawnow;

[rows columns numberOfColorBands] = size(rgbImage)

blockSizeR = 64; 
blockSizeC = 64;
wholeBlockRows = floor(rows / blockSizeR);
blockVectorR = [blockSizeR * ones(1, wholeBlockRows), rem(rows, blockSizeR)];
wholeBlockCols = floor(columns / blockSizeC);
blockVectorC = [blockSizeC * ones(1, wholeBlockCols), rem(columns, blockSizeC)];

if numberOfColorBands > 1
  
  ca = mat2cell(rgbImage, blockVectorR, blockVectorC, numberOfColorBands);
else
  ca = mat2cell(rgbImage, blockVectorR, blockVectorC);
end

plotIndex = 1;
numPlotsR = size(ca, 1);
numPlotsC = size(ca, 2);
for r = 1 : numPlotsR
  for c = 1 : numPlotsC

    subplot(numPlotsR, numPlotsC, plotIndex);
    
    rgbBlock = ca{r,c};
    imshow(rgbBlock); 
    [rowsB columnsB numberOfColorBandsB] = size(rgbBlock);
    
    plotIndex = plotIndex + 1;
  end
end

I have 16 blocks as shown in link 

http://imgur.com/xmT3Q

now in this some blocks may have same mean value,i have to give same colours for blocks having same mean value,and other colours for other blocks,please help

Answer 1

[Image Analyst]

I don't know what mean value i means in regard to a color image. Please explain. Also, you should know by now how to format your question into code and non-code parts, and to make links to web sites.

[Pat]

I have 16 values from my above code ,in that i have to take mean or average for each block

1.i will have 16 mean values one for eachblock

2.i have to make each block a different colour,if there are same mean values those block must be of same color

3.for example if block 4 and 10 have same mean value ,those blocks must be of same colour

please help