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You can also use just about any other type of paper for this, including cardstock, construction paper, or even plain old printer paper. You can also make the square smaller, but it must be a perfect square. If you just used tape, then your bookmark is ready to go. If you used glue, paint, or markers to decorate it, however, you might want to give the bookmark a little time to dry. This way, you won't ruin the pages of your book.
Get some 6 by 6-inch (15.24 by 15.24 centimeters) origami paper. Let the bookmark dry, if needed, before using it.