What does Domo, Hello Kitty, Darth Vader and Jesus have in common? They can all appear on your morning toast. Why? Because they are simple enough to be recognizible in low quality reproduction.
Printing technology has improved signifacantly in the last decade. You're not limited to just single color logos for your brand. But if you plan to carve your logo into marble or burn it into a toast make sure it works in a single color. The simpler the better, think Apple or Nike.