This is not a typical sorry card. Those are for people too scared to say it in person. Which I'm not. Obviously. But I am very, very sorry. And an idiot. Obviously. 
 
A striking black and grey fold-out concertina card that speaks the truth. No frills. Just a well-meaning message to express your deepest apologies. Also available as a rose gold greeting card if metallic foil is more your thing.