Elf shoes traditionally have pointy toes that often curl up and end in a bell, but since the Tolkien "Lord of the Rings" films, people's understanding of what an elf shoe is has changed. Elf myth deems that while not a materialistic people, they are offended by things that are not beautiful and fine, so the key to make your elf costume believable is to pay attention to detail. You can adapt almost any pair of shoes into believable elf shoes with just a few simple tweaks.
Put one of the shoes you will be wearing with your costume on your work surface. With duct tape, attach one piece of construction paper to the outside of the shoe so the edges line up with the edge of your sole. Fold the paper so it covers your laces and extends 2.5 cm down the inside of your shoe. Trim the excess paper off the side (but leave the paper so it covers the toe of your shoe) and crease the paper so it holds its shape bending over your shoe.
Tape a second piece of construction paper to the inside of your shoe (at the edge of the sole) and bend it over your laces and over the other piece of paper. Tape the two pieces of paper together from the bottom of your laces to the toe. If you want a pointed toe, pull the paper tightly together to shape the point, and tape it. For a rounded toe, tape the papers together so they lay flat and follow closely the shape of the shoe underneath.
Trim the paper that goes from the inside of the shoe over the laces so the part that lays on the outside of the shoe is lower towards the heel and angles up towards the toe. Mark four or five points on either side of this outer flap with a pencil where you will put holes for laces.
Carefully untape both pieces of paper from the sides of the shoe, being careful to keep them connected by the tape you applied to form the toe. Add tape to the underneath of the paper to reinforce all of the edges and the underside of where the toe is taped.
Use a hole punch to make holes through both pieces of paper where you placed your lace marks. Punch holes in the paper near the heel so you will be able to close the back of the shoe as well. Make two holes at the bottom paper and opposite each other so you will be able to run a tie under your shoe at the arch, to hold the covers on.
Cover the entire outside of the paper with glue (but be careful not to let them glue together) and press your fabric into the glue, making sure that no air bubbles form. Lay the covers back over the shoes (to help them keep their shape while drying) and wait two hours before continuing to finish your elf shoes.
Cut through the fabric where you punched the holes for the laces and snap the fabric eyelets in place. Thread your yarn through as if lacing a normal shoe, place the cover back on your shoe and tie the yarn through the two holes you put on the sides, under the arch of the shoe to hold it in place.Then tie the heel laces, put the shoes on and lace the sides closed and you are done.
Glue fabric to the underside of your shoe covers as well; this will make them sturdier then if only covered on one side.
When gluing the fabric onto the paper, be careful not to let the flap formed by the two pieces over the laces of your shoe glue together, or you will not be able to wear them.