Have you ever turned around to find someone not there? Perhaps you can recall losing your mother at the mall or a pet who ran off chasing a squirrel. Whether you know it or not, we all have someone important to us. Those emotions can be used towards your work. To help you get started, here are some shorts I thought up of:
(you may use for ecards or such)
1. The world without light is a world without you.
2. I don't like this game of hide and seek.
3. You can call me a fool, but it is you I look up to. (Oh wait... that's harsh.)

And as a sidenote, here is a scan I found that might go along with your words. (Feel free to use in your ecards or wallie.)