Using Heat to Patina a Copper Back Splash?

I want a copper back splash. I have been online for a week to try and get some answers. I need to know how to burn the copper and bring those colors out. I think they call it patina. All I have found is chemical ways, and I do not want to mess with that. I want to burn it, get it the way I like it and then seal it. I hope someone out there can help me.