Printable Bookmarks in square or rectangular shapes are easiest to design and use. Bookmarks also come with paper pins whereas the triangle Printable Bookmarks are wrapped with pages and also come in variety of designs and looks. Usually both sides of bookmark are printed as same design and shape. It can come in square, rectangular, triangle, or any other customized shape according your choice. First you need to define what kind of design you would like for your bookmark.
You can also create your own printable bookmark free template at home with a little effort. You can also get the free templates of Printable Bookmarks from internet. Printable Bookmarks come in different materials, customized sizes, and variety of colors in market.