Changing culture is HUGE! Make sure your supervisors are committed and employees understand their boss cares.
How about -
"If you do something someone told you was unsafe/you considered unsafe, I will terminate you on the spot"
If anyone asks about your company, what you do, or what you make, respond "Safety is our business!"
This site, which I found by googling "Safety Slogans", has 1000 different safety slogans. The first few are jokes, but if you scroll down to the list, there are quite a few gems - http://www.safetyris...safety-slogans/
My favorites so far
Arms work best when attached to the body
Hand in, hamburger out.
Tomorrow – Your reward for working safely today.
Safety first makes us last
Though I tend to lean toward the gruesome humor.
-Majors