b = Bitmap( 100, 100 )
  
for x=0, 100, 10 do
  for y=0, 100, 10 do
    b.rect( x, y, x+10, y+10, Color(random(255),random(255),random(255)) )
  end
end
  
b.save( cf.attributes.dir..'example01d.png' )