Turn your sock inside out.
Hold your camera/ipod/ etc. against the sock to see how much room you need.
Sew across the bottom. You can do a straight line, but I tried it both ways and I like the look of a little more rounded.
Turn right side out and drop your camera into the case.
My camera already has a strap, but if you want a handle just turn the case inside out and sew the ends of a piece of ribbon/fabric to the sides.
Easy peasy lemon squeezy!