Apparently, this golden charm is one of the most popular cell phone accessories in Japan, with almost 3 million units sold. At this point, you're probably thinking that it looks a lot like something a dog might do on your living room rug. If so, you're right. It looks like golden poop and it is supposed to be a good luck charm.
If we absolutely had to pick one, we'd opt for the version that appears to be filled with gold dust and is slightly more tasteful than the alternatives. Under no circumstances would we want to take the catchers' mitt charms, which represents "catching money", because it would be too easily mistaken as a symbol of cleaning up after the previously-mentioned dog for our comfort.