2 added 809 characters in body
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Magnify 10 times or more, ...

The basic idea is to use a GraphicsGrid

blocks = Table[{Graphics[{Darker@Green, Rectangle[{0, 0}, {100, 20}]},
  ImagePadding -> None, PlotRangePadding -> None]}, {i, 6}]

myGrid = GraphicsGrid[blocks, Spacings -> Scaled@.0, Frame -> All]

The options differ slightly for GraphicsGrid, see DocumentationCenter

Edit1: More workarounds... Another approach is to "Rasterize" Graphics output or to "Pane" it

    blocks = Table[{Graphics[{Darker@Green, Rectangle[{0, 0}, {1, .2}]}, 
         ImagePadding -> None, PlotRangePadding -> None]}, {i, 6}] // 
      Map[Rasterize, #, {2}] &
    myGrid = Grid[blocks, Spacings -> {0, 0}, Frame -> All, 
      FrameStyle -> {Blue, AbsoluteThickness@3}]

    blocks = Table[{Graphics[{Darker@Green, Rectangle[{0, 0}, {1, .2}]}, 
         ImagePadding -> None, PlotRangePadding -> None]}, {i, 6}] // 
      Map[Pane, #, {2}] &
    myGrid = Grid[blocks, Spacings -> {0, 0}, Frame -> All, 
      FrameStyle -> {Blue, AbsoluteThickness@3}]

In simple cases setting grid's "Background" to Darker@Green is an acceptable workaround.

Magnify 10 times or more, ...

The basic idea is to use a GraphicsGrid

blocks = Table[{Graphics[{Darker@Green, Rectangle[{0, 0}, {100, 20}]},
  ImagePadding -> None, PlotRangePadding -> None]}, {i, 6}]

myGrid = GraphicsGrid[blocks, Spacings -> Scaled@.0, Frame -> All]

The options differ slightly for GraphicsGrid, see DocumentationCenter

Magnify 10 times or more, ...

The basic idea is to use a GraphicsGrid

blocks = Table[{Graphics[{Darker@Green, Rectangle[{0, 0}, {100, 20}]},
  ImagePadding -> None, PlotRangePadding -> None]}, {i, 6}]

myGrid = GraphicsGrid[blocks, Spacings -> Scaled@.0, Frame -> All]

The options differ slightly for GraphicsGrid, see DocumentationCenter

Edit1: More workarounds... Another approach is to "Rasterize" Graphics output or to "Pane" it

    blocks = Table[{Graphics[{Darker@Green, Rectangle[{0, 0}, {1, .2}]}, 
         ImagePadding -> None, PlotRangePadding -> None]}, {i, 6}] // 
      Map[Rasterize, #, {2}] &
    myGrid = Grid[blocks, Spacings -> {0, 0}, Frame -> All, 
      FrameStyle -> {Blue, AbsoluteThickness@3}]

    blocks = Table[{Graphics[{Darker@Green, Rectangle[{0, 0}, {1, .2}]}, 
         ImagePadding -> None, PlotRangePadding -> None]}, {i, 6}] // 
      Map[Pane, #, {2}] &
    myGrid = Grid[blocks, Spacings -> {0, 0}, Frame -> All, 
      FrameStyle -> {Blue, AbsoluteThickness@3}]

In simple cases setting grid's "Background" to Darker@Green is an acceptable workaround.

1
source | link

Magnify 10 times or more, ...

The basic idea is to use a GraphicsGrid

blocks = Table[{Graphics[{Darker@Green, Rectangle[{0, 0}, {100, 20}]},
  ImagePadding -> None, PlotRangePadding -> None]}, {i, 6}]

myGrid = GraphicsGrid[blocks, Spacings -> Scaled@.0, Frame -> All]

The options differ slightly for GraphicsGrid, see DocumentationCenter