You will find many machine embroidery applique designs on this page. They range from holidays to every day embroidery designs.
NOTE:  I recommend using a lightweight paper backed fusible such as Steam a Seam Lite or Wonder Under on the back of your applique fabric prior to embroidery. What this does, it keeps your fabric from fraying, it makes it easier to trim, it keeps the fabric from pulling from the stitches and after you fuse it to your base fabric, it keeps the fabric from puckering after washing.