Our shift pattern is based on a 4/4 rotation as well but it entails 2 - 12 hour morning shifts 0700 - 1900 and 2 - 12 hour evening shifts 1900-0700.
You could work 4 straight mornings and 4 straight evenings but we prefer having the break in between the last morning to the first evening shift although your last night shift cuts into your first day off.