In our last house, we had black aluminum window frames and black roller blinds. When up, they virtually disappeared from sight because of the match with the frame. When down, since most of them were sunscreen rather than blockout, there was still plenty of light and we still had the view.
Your curtain or blind choice really depends on what look you are trying to achieve and whether or not you need your window treatments to provide a thermal block. My first thoughts are sheer linen curtains in a mushroom or beige colour, similar to your lounge to soften the dark window frames and leather couch.
bigreader
jmm1837
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