I like roses for romance. Carnations are super-decorative for every other thing... but they work for romance too.*
I drive past these flower stands... the town where I live must have three flower stands, a florist, and people selling bouquets by the highway offramps at every exit. Every single time I think of my GF. It's terribly wasteful to buy a bouquet just for a picture to send in an email or in a messaging app, but I think about doing it anyway...