As a fan of Deathnote, I want to be a Shinigami for halloween this year. Not any in particular from the series, I'm going to make my own look up :) I figured a pair of bat-like ears would be a good start!
This took me about 3 hours to do over a couple of evenings because I was making it up as I went along, but with this tutorial yours should go a lot quicker!
Gather your materials. You'll need black and white felt (or whatever colours you want to make yours!), a sewing needle, thread in black and white (or whatever;P), two hair clips (I used the type they use for fake hair add-ons, they cost me £1 each from the market :S anyone know where I can get them cheaper?!), scrap paper for planning your patterns on, a pencil, pins to hold bits in place, and scissors.
(At this point you can choose to put in some stuffing. I didn't because I find the felt is study enough without, plus I don't want them to be too heavy.) Pinch the base together and sew it shut so that the inner ear base cannot be seen in the fold. Turn the ear to the left and sew on a hair clip, being as thorough as you can because this is the bit that will get most wear. On the other one, turn the ear to the right so that you sew the clip onto the other side, otherwise you'll end up with two left ears or two right ears.