Since warm and cool greens have such distinctive qualities a good way to select a pleasing curtain color for a green walled room is to determine whether your walls are warm green or cool green.
Colour curtains to go with green walls.
The one you see here looks more like a blue tone instead of green.
For a color coordinated look with patterned curtains make sure the pattern contains at least a bit of the wall color.
The green walls have hints of red and varying shades of green which gives it a rich look.
Blue walls and sandy color curtains for a calming atmosphere with a warm touch.
If your walls are white or ivory choose a pattern with a white or ivory.
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It can create a different look based on the light in the space.
The only change i d make to the room is replacing the carpet with hardwood flooring.
Combined with the white crown molding and fireplace mantel this green works very nicely.
If you are curious about the wall paint used here it is benjamin moore yorktowne green hc 133.