clever and clean ways to tell a girl you like her?

My son wants a unique way to tell a girl he likes her, he wants something spontaneous and original. Nothing nasty please. They live 50 miles apart, so if he showed up at her work, it would have to be simple and fun. They text each other almost every day, and call on occasion. Please send as many cute clean and fun ideas as you have. They haven't held hands yet, so the relationship is pretty new. They are in their early 20's