Whatever holiday your dad has, he, like any other person, wants to be the center of attention on this day. The more original your congratulations are, the warmer and more joyful your closest person will be.
Originality is part of the unpredictability. If you are a daughter or a son, you probably know many interesting facts about your father, even those that he usually does not advertise. Congratulations are not always a thing or words. Our environment is also a part of our life. If you know your dad hasn't spoken to his friend for a long time, make an effort to contact him and invite him to the celebration. Men value friendship very much, so the visit of a friend will be for him something more than just gatherings and conversations about anything.
Your father is a creative person: artist, artist, composer. Probably, he lacks some thing for fruitful work. It can be just a folder for storing manuscripts or a set for stationery (especially since creative people are very sinful with clutter). Give him what is missing. It is also helpful to remember that all arts are related. You can give your dad a ticket to an institution in a different creative field than the one in which he is engaged. For example, father is an actor - present a ticket for an orchestra performance. Or, on the contrary, the father is an orchestra artist - present a ticket to the theater. Perhaps he will be inspired by something, and he will give the world a new creative work.
If dad has a hobby or hobby, get a unique copy for his collection or a unique item for organizing his leisure time, especially since the Internet is rich in offers of goods of any nature, and on the forums you can ask a question and get good advice on choosing the right item.
Provided that your dad is surrounded by a rather pragmatic type of activity, he probably lacks home warmth and comfort. The originality of congratulations can begin with the postcard itself. You shouldn't remind him about work, let the postcard be full of soft shades, flowers or fabulous landscapes, especially since now you can choose any postcard up to 3d.
Memorized verses and familiar phrases will also not add originality. Take the time and imagination to come up with and then say sincere words, especially if you are miles apart. Remember: words can give a person strength.