When someone comes to your mind like a friend write down what you are thinking. For example what they mean to you, the gifts and talents they have.
The next time you see them or email what you have written down. It is an excellent way to encourage them. I am sure they will appreciate it.
It is an excellent way to exercise your mind as well. It may even bring to you about your gifts and talents as well.
Since this is the holiday season now writing a card to them is a good idea. If you are writing to a couple than write down the gifts and talents they both have. They have children write for each one of them as well. You may have even a better friend in the end.