This is a basic origami and it's very nice, all you need is an A4 Printer paper and some scissors. When you finish it comment. (Don't aim in the face with the ninja stars !!!)
Step 1: Step 1: Basic Cuts and Folds.
First, take the A4 paper and fold it in half. Then unfold it and you can see the middle line. Take the scissors and cut it in half.
Step 2: More Foldes and Cuts.
After you've cut the A4 paper in half, take one of the half cut paper and fold it again (place it horizontal and fold horizontal). Now fold it again the same method.(for help see in pictures i uploaded). Now, fold it vertically.(for help see in uploaded pictures).
Step 3: The Cut and Half a Ninja Star.
OK, after we've folded vertically, we need to cross-fold it. OK here is what i mean, you have a line in the middle of your foldet paper, you have to fold the edge i show you in picture with the line. Then turn it 90�, and do the same. Now flip it over and fold the tips of it to form almost a square, and cut the upper almost square off.(see in uploaded picture for help).Then, fold the upper right edge with the lower left edge. Do the same for the other side. Now once you've done both sides, fold the triangles you have just made on the parallelogram.(if you don't know what a parallelogram is see the bog on one of the pictures). Then do the same to the other side. It should look like the last picture of this step.
Step 4: The Final Fold.
Now, once you have made one half, you have to do another half. It's the same as the other one.(the first half). Now you have to fold the two half into each other. Hold each half one vertical and one horizontal. Put them onto each other.(see pics for help). Now start folding each triangle onto each other. Then the last triangle put it under the first triangle you've fold down. And there you have it, the origami ninja star. wOOOOOOOOOOOT!!