For most couples, there’s the morning “goodbye” as you go on to your day and the “hello” after the day. Make those meaningful.
As possible, actually say “good bye” to each other face to face. Add your own flair – a wink, smile, a quick note. Of course, you can add something special from time to time.
Then there’s the time of day when you re-enter each other’s world. Say “hello” face to face. Greeting each other should be the first thing you do – before checking the mail or saying hello to the kids. (This should be a priority; you might talk about how you might do this in the hecticness of family. You might call home with your estimated time of arrival so that you both are prepared.)