Give the gift of knowledge along with cash. Buy a good book you think the receiver would love, and insert some cash as a bookmark. It'll be extra nice if you leave it on certain page that you think would appeal most to the person you're giving it to.
Add a nice little note explaining your gift and the page you marked. You can say something along the lines of, "I thought this particular paragraph was pretty inspiring, and it reminded me of your strength and perseverance."