These curtain rods are from ikea but I would prefer this single curtain rod. That way the cloth could completely cover it and you would not see any of the hardware.
This look is very simply achieved with a cloth napkin hung over the rod so two corners meet at the lowest point. If you have a long window you can layer the napkins to make it all the way across.
Because this look is so simple to put together you can change the napkins out for the seasons or to match your table.