if it is a simple shape, some people do the following:
cut out two shapes...one that will be the top, and the other that will be the bottom. in this case, a light-colored fabric will be the bottom. add 1/4" seam allowance all the way around on both pieces.
rights sides facing, sew the two shapes together using 1/4" seam, leaving a couple of inches for turning.
clip seams at the curves, if there are any, so that when turned, the applique will lay flat.
turn the right sides out and press, making sure that the open area follows the correct shape of your applique. whip stitch the opening closed.
applique piece to the quilt.
maybe someone can give you visuals of this process.
this is just another way to applique.