The best length for hanging curtains is right below the windowsill or all of the way to the floor.
Here are some ideas for inexpensive window treatments without having to hang your average 84″ length curtains at an awkward length.
2. Use 84″ sheer curtains on all of the windows in a room expect for a focal wall. This will save you money for 96″ or longer curtains. In my living room the sliding doors have a second curtain rod with 96″ curtains to bring the eye up. It definitely makes the room feel more grand. My favorite places for 96″ curtains are IKEA, Target, and TJ Max.
4. To cover ugly blinds, cut out a rectangle piece of fabric, sew a pocket for the curtain rod, and embellish with ribbon. Even easier, use a tension rod in the window frame to hang your valence.