I bet you'll discover parts of yourself that you never knew existed. It could be a framed photograph you took, or perhaps a poem. Making a card is a wonderful way to say hello and show how much you care. It's also a very memorable thing to do. If you don't think you're artistic, cut out pictures from a magazine and stick them on card.
Montages are hard things to make look bad.
You might be surprised at just how talented you are in that area.