Define the height you want the ear to be - by holding a ruler up to you head (highly scientific approach) - and build a triangle similar to shown. You can use these shown measurements as a guidelines - but your proportions might be a little different.
Adjust the shape to have the curves following a more natural outline of the ear. Cut out the paper triangles..
Step 2: Cut out Fosshape
Trace the template onto the Fosshape. Cut out 2 large shapes and 4 smaller shapes for the base of the ear (two bases per ear).
Step 3: Sew the ear parts together
Sew each ear shape to one base:
Step 4: Harden the Fosshape
Now shape and harden the ears using a steamer or heat gun. They will shrink about 1.5 times (left ear treated with heat and right one not yet shown for comparison), so take that into consideration when choosing the final product size.
Step 5: Attach the hair clip
Sew the second bottom to the ear and insert the hair clip. Heat shrink the bottom layer.
Step 6: LED
Insert the LED into the inside of the ear with legs poking out from the other side.
Step 8: Rhinestones
Now the fun part - use hot glue to attach the flatback rhinestones to the inside of the ear.
Step 9: Fur
Use small tufts of fake fur to disguise the bottom of the ear. Sew them in place.
Step 10: Finishing
Optional - use some cord/ribbon (in this case a ball chain) to finish the ear edges!