This is interesting, ways to say I love you. For me, apply the three C's.   Seize every opportunity to Compliment, Commend, and Congratulate your partner. 

Apply the advice of St. Paul: "Whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable- if anything is excellent or praise worthy- think about such things."  Think about your partner's personality and actions,identify those things that are "excellent or praiseworthy" and compliment your life-partner  for them.

There are lots of ways to show your special someone on how to show your love to them. As long as it comes from the heart its priceless.

Study your partner until you know him better than he knows himself . Watch carefully as your spouse relates to friends, and observe what kind of compliments are responded to. 

Show her that you are sincere in your words towards her .Lavish her with praise . Heap  words of appreciation upon her.

Talk each others of the daily activities during evening time . Talk in a way that you were still sweethearts( not yet married ). Turn off the TV.