The templates I have don't have all the markings on them that a ruler does. But I do use a 4.5 inch square ruler as a template when the need arises. As to whether you can cut around them with your rotary cutter...how thick are your templates? If they are thin and can be cut by the rotary cutter, then you wouldn't want to cut around them, because you could change the shape. If they are thick, then you should be fine. My templates are made of a similar material to my rulers and are very hard.