The National Secular Society recently ran a competition to write a Secular Thought for the Day in the style of BBC Radio 4's stubbornly unsecular Thought for the Day.
I've just posted my entry on my personal website. It didn't win, but Charles Darwin gets a mention, so you might want to check it out.
Off topic but did you notice the winner of the Guardian Student film competiton - http://www.guardian.co.uk/education/2013/mar/21/student-film-competition-winner-announced - was about evolution.
Yes, I did. Thanks for reminding me, though, as I meant to link to it.