Two layers

-- 1 - obsidian
-- 2 - quartz

shrek1={
           {},
           {},
           {1,1,1,1,1,1},
           {2,0,0,0,0,1},
           {2},
           {2,0,0,0,0,1},
           {1,1,1,1,1,1},
       }

shrek2={
           {},
           {},
           {2,3,3,3,3,1},
           {1,0,0,0,0,3},
           {1},
           {1,0,0,0,0,3},
           {2,3,3,3,3,1},
       }

shrek3={
           {1,0,0,0,0,1},
           {4,0,0,0,0,1},
           {1,3,3,3,3,1},
           {5,0,0,0,0,3},
           {1,0,0,0,0,3},
           {5,0,0,0,0,3},
           {1,3,3,3,3,1},
           {4,0,0,0,0,1},
           {1,0,0,0,0,1},
       }

shrek4={
           {},
           {1,0,0,0,0,1},
           {1,1,1,1,1,1},
           {5,0,0,0,0,1},
           {1,0,0,0,0,1},
           {5,0,0,0,0,1},
           {1,1,1,1,1,1},
           {1,0,0,0,0,1},
       }

shrek5={
           {},
           {},
           {2,2,2,2,2,2},
           {2,2,2,2,2,2},
           {2,2,2,2,2,2},
           {2,2,2,2,2,2},
           {2,2,2,2,2,2},
       }

 shrek6={
            {},
            {},
            {},
            {6,6,6,6,6,6},
            {6,6,6,6,6,6},
            {6,6,6,6,6,6},
        }

shrek7={
           {},
           {},
           {},
           {},
           {6,6,6,6,6,6}
       }

function buildLine (colors)
    for i = 1,#colors do
        slot = colors[i]
        if slot~=0 then
          turtle.select(slot)
          turtle.placeDown()
        end
        turtle.forward()
    end
    turtle.turnRight()
    turtle.forward()
    turtle.turnLeft()
    for e = 1,#colors do
        turtle.back()
    end
end

function buildLayer(image)
    for i=1,#image do
         line=image[i]
         buildLine(line)
    end
  turtle.turnLeft()
 for i=1,#image do
    turtle.forward()
  end
  turtle.turnRight()
  turtle.up()
end


buildLayer(shrek1)
buildLayer(shrek2)
buildLayer(shrek3)
buildLayer(shrek4)
buildLayer(shrek5)
buildLayer(shrek6)
buildLayer(shrek7)