Take a standard 8.5 x 11 sheet of paper. Trim it so you have an 8.5 x 8.5 inch square.
Fold the square in half.
Fold the rectangle you have just made in half again so it looks like a smaller square. Make a crease, and unfold it again so it looks like a rectangle with a crease down the middle.
Fold the above shape in half down the middle. Now you have kind of a cone shape with a very pointed end and a wider end.
Cut off the wider, uneven end. Experiment with cutting it off at different angles.
Now, take the triangular shape you have left and make cuts on the edges. Cut out small triangle shapes, heart shapes, rectangles, etc. along all of the edges.