This app lets you design your own geometric net for an oblique square pyramid:

[Oblique means that the apex (top) of the pyramid is not directly over the center of the base.]
[Square means that the base is a square.]
[Pyramid means that the sides come to a point at the top. This point is called the apex.]

Click the blue points to change the figure. If the line segments cross each other, the figure will not work. If the dotted lines are on the outside of the net, the figure will not work. Once you have changed the figure to how you like it, print it out and construct the pyramid:
[Cut along the solid lines.]
[Fold along the dotted lines.]
[Tape together with clear tape.]
If you want to color your pyramid, do so before you cut it out. If you want to decorate your pyramid, construct it before you decorate it.