A mask is the one essential piece of equipment for the ninja. Shurikens, swords, caltrops; these are all superfluous, as ninjas are total badasses in empty-handed combat. However, when a ninja is being a badass (all the time), he has to remain anonymous. Mysterious. Delicious. Hence, the mask.
Ergo, if you want to be a ninja, or at least look like one, you need a mask. Preferably black. Let's get to the skinny.
First, find a black t-shirt. If it has something on it, turn it inside out. Then...
    1. Put the shirt on your head backwards, with the tag under your chin (or on it, as it may be) with just your face visible through the neck. THIS IS IMPORTANT: Attempting to follow the subsequent steps in any other configuration will result in serious injury or quite possibly death.
    2. Pull the shirt snug against your face and tie the two arms together behind your head.
    3. Fold the upper cloth under itself (to hide the collar) and pull it down just above your eyes.
    4. Do the same thing with the bottom cloth, and pull it up to just under your eyes.
    5. Fine tune the mask. Elimitate as many creases as possible, and make the opening only as large as your eyes. If necessary, start over, only tieing the shirt tighter, or using a shirt with a smaller neck.
Congratulations. You are a ninja; don't let anyone tell you otherwise. If they do, pop a boner, flip out, and kill them. Actually, you should do that anyway, because that's what ninjas do.
Enjoy yourself. This is utmost in importance.

My own version of the method described in the tutorial of Vern Reld, who seems to enjoy Christmas more than ninjas.

Most boys at a young age learn or figure out how to make a ninja-like hood from a black t-shirt by tying the sleeves behind the head with the neck hole placed over the eyes. Modern ninjas, such as SWAT teams and black ops, wear a custom tailored black balaclava, which is doubly cool since you can wear it just on the top of your head like a stocking cap, and then when it's time to go into action, you pull it down over your face and cock your mp-5.

But real ninjas lived and flipped out and killed people long before the t-shirt was invented in 1913. Having no t-shirts, they used a large square of black silk, about five or six feet square. A silk blanket such as this has many uses for a vagabond; you can wrap up all your personal effects and tie it to a stick, lay it out and have a picnic, etc. With your own black silk blanket, you too can make an authentic ninja mask in the traditional fashion!

First, fold the square of fabric diagonally, corner to corner, making a right triangle. Fold this in half, from one 45 degree corner to the other, making another, smaller right triangle.

Taking the two 45 degree corners in your hands, hold the triangle over your head and move your head inside the fold next to the right angle. Look up, so you can see out between the two sides of the fold. Bring the ends down tight against your face, so that only your eyes are showing. Tie the corners in the back. Now you're ready to jump out of a tree and ambush someone.

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