Stack of video thumbnails

I have a simple image in a matlab, and the a simple graphical overlay. For example

img=imshow('pic1.bmp');
[m,n,c]=size(img);
for i=1:1000
imshow(img);hold on;
plot(rand(1)*n,rand(1)*m,'g+');
drawnow;
end

Is there a way in Matlab,to obtain one big image containing all figure thumbnails made at each time step?