The main point of a morning offering is to offer your day to God. To help symbolize that my whole day is a prayer to God, I make the sign of the Cross at the beginning of my morning offering, but do not make the sign of the Cross at the end. This reminds me that I have not finished my prayer, and that everything I do today is part of that prayer.
Over the years my morning offering has evolved. At one point it took over 10 minutes, nowadays it's shortened back down to about 5 minutes. Here is most of it:
O my God, I offer everything I do today in reparation for Thy Sacred Heart and in union with all the Masses offered throughout the world and especially so that I do not commit any sins of [insert any fault you are trying to overcome]. For my parents, for my brothers and sisters, for all my relatives and friends. For the Pope, for all the Bishops, for all the priests and seminarians, especially those familiar to me. For school, so that I succeed in it for the Greater Glory of God, for work, so that I succeed in it for the Greater Glory of God, for home, so that I succeed in it for the Greater Glory of God. For [and particular projects I'm currently working on]. For [any sick people I know]. For [any other special intentions]. For all my Godchildren. For [each sibling and their families].