All the ornaments are symmetrical with respect to the horizontal and vertical axis and can be used in a square area that needs to be decorated.
To modify these ornaments you will need vector editing (Adobe Illustrator, Inkscape, CorelDraw..) or 2D CAD software (AutoCAD, Solid edge 2D Drafting, NanoCAD (Free version)...).
Hopefully, these square ornaments will inspire you to use it in in some of your future craft or graphic projects.