%% File ColorSpyMatrix.m
clear
A=zeros(16,16)
A(5:12,5:12)=1  % any nonzero
%% Line Specification='Line style, Marker symbol,Color'
spy(A,'.r')  % spy(A,'sr');% - for square shape
%% But I want to edit propertis of my "picture"; 
% axes is parent for picture and...
pAx=get(gca,'children')
                          %           Color: [1 0 0]
                          %           LineStyle: 'none'
                          %           LineWidth: 0.5000
                          %           Marker: 'square'
                          %          MarkerSize: 6
                          %          MarkerFaceColor: 'none'
%  lets we will change properties
%% Line Specification='Line style, Marker symbol,Color'
subplot(1,3,1)
spy(A,'or')  % spy(A,'sr');% - for square shape
%% But I want to edit propertis of my "picture"; 
% axes is parent for picture and...
pAx=get(gca,'children')
                          %           Color: [1 0 0]
                          %           LineStyle: 'none'
                          %           LineWidth: 0.5000
                          %           Marker: 'square'
                          %          MarkerSize: 6
                          %          MarkerFaceColor: 'none'
%% lets we will change properties
set(pAx,'MarkerSize',20,'MarkerFaceColor','y')   % 'MarkerEdgeColor' exists too 
%% You need to think about the size of the marker!  The quality of your image depends on this property!
B=A; B(6:11,6:11)=0;
subplot(1,3,2)
spy(B,'m.');
pAxBorder=get(gca,'children');
set(pAxBorder,'MarkerSize',30,'MarkerFaceColor','m')
set(pAx,'MarkerSize',20,'MarkerFaceColor','g')   % 'MarkerEdgeColor' exists too 
%% You need to think about the size of the marker!  The quality of your image depends on this property!
B=A; B(6:11,6:11)=0;
subplot(1,3,3)
spy(B,'gs'); 
hold on  %          We need! Why?
pAxBorder=get(gca,'children');
set(pAxBorder,'MarkerSize',20,'MarkerFaceColor','m')
spy(B,'b.');