A sheer white panel is a clever way to cover your window while stil allowing some light to shine in.  You can sew smaller pieces of linen to get a patchwork look like this, or hang a single piece.  Either way, it'll look great!  You can even just tack it on with some pins if you don't feel like using a hanging rack.  This is a nice trick that allows you to easily remove your curtains whenever you want.  A great linen for the job is IL030 because it is so light and airy.  These sheer curtains are great in the summer as a way to quickly decorate any room while letting some natural sunshine in.