We found this great tutorial for making super-cute cat ears from crafty blogger Tally's Treasury
What you will need:
headband - doesn’t matter what it’s made of or what it looks like, though you may want one the same colour as your cat ears, or as your hair. You do want a thick headband, about an inch to an inch and a half wide. Those super thin ones won’t work too well.
felt in 2 colours – one will be the main colour of the ears, the other the colour of the ears’ inside. Sure you can do these in normal cat-ear colours (perhaps matching your own hair colour, perhaps in contrast to it), but you can also have bright pink or purple feline headgear, or any other colour. Why not?
paper – feel free to use stuff from the recycling bin – it’s just to draw a pattern on.
pen or pencil
small sewing needle
thread or embroidery floss - in the same or a similar colour as the main colour of your cat ears