Green sheers with brown drapes would work, but you really need a touch of something else. It would be tricky, but certain oranges might work as would gold, yellow - something in that family. You don't give the wall color so I am presuming off-white.
Window coverings to match the walls would make the rooms appear more spacious and then use the same or near color for sofa pillows, chair cushions to tie it all together. A striped material of green, brown, and something would also do the trick. I have such of green, brown, ivory, and red in a room paneled in knotty pine.
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