Good idea for bathroom window.Window screens made from lace curtain fabric. By mounting the lace on a frame inside the room you can change the mood in your room by adding or removing the screen from your window.
Materials: KNUFF Magazine file set I have found this idea on one czech website, Napadyproanicku. You need three pieces of Knuff magazine files, wooden blocks, hot glue gun. Magazine files and block (Diy Furniture Redo)