What are some Powerful, Easy, Fun and Cheap ways to show someone you love them?

I’m looking for powerful, fun, easy and cheap ways to express my love to my wife. I used to hide little notes and that was fun for the both of us. Sometimes,I’d stop on the side of the road and bring her wild flowers. I often give her foot massages or hot rock massages – get the idea? I’d like to have an arsenal of new ideas that would sustain my daily efforts for at least a year.