For me, curtains can be tricky, I had to change my curtains twice before I find out what is the best curtains suitable for my living room theme.
As fashion develops, so does interior design and all its aspects. Unless your house is typically old french or British classic, you have very limited modern and contemporary classic curtains options (In my opinion).
Ebtisam Al-Shamali, A kind follower, sent me a picture of her pretty and well decorated living room. Instead of curtains, Ebtisam customized a wooden doors for the windows. I really loved them, they give such a warmth to the living room. The wooden window doors look very chic and classic, and suitable for modern and contemporary classic theme.