chocri is a German startup, founded in September 2008, but launched in the US in January 2010. They allow you to customize your own chocolate bar on their website. You get to choose a base chocolate (white, dark or milk chocolate), and then your favorites out of more than 100 toppings. Those can be nuts and dried fruit, but they can also be real gold flakes, roasted almonds, pretzel, chive rolls, jalapenos... you name it! They hand-make the bars in Germany, and ship them to you.
Read more on create your own chocolate bar and list of local chocolatiers