What are some meaningful lyrics?
It depends on the requirements of your project, but you might consider looking at the lyrics for some of the top songs on the charts right now. I really enjoy the intricacy of Ed Sheeran's song "The A Team" because the lyrics of the song involves so much figurative language. The song is about drug addiction, but rather than glamorizing it, Sheeran portrays the sad reality of that lifestyle.
As for writing your own lyrics, consider writing on a topic that is meaningful to you. You could channel your inner 'Taylor Swift' and write lyrics about your latest break-up, or write inspirational lyrics that relate to some difficulty or obstacle that you have had to overcome.