Poem or nice sentiment for parent's wedding gift?

My fiance and I are giving gifts to our wedding party and parents at our rehearsal dinner the night before our wedding. The gifts I chose for our parents are really nice picture frames, which we will give them professional wedding photos to put in once we get them. For now, I'd like to handwrite a nice message or poem and put it in the frame, thanking them for their support and help. We paid for most of the wedding but they gave us the bridal shower and rehearsal dinner. I don't want it to be anything too specific, just a nice sentiment to show our gratitude and love.