Here are some bars that are almost perfect. Check descriptions below for updated fragrances (and the mistake made).
Mermaids Garden - I accidentally put in coffee grounds instead of finely chopped Dulse (seaweed)! They are very close to the same color and size. One scoop, a quick "yelp" and the mistake could not be un-done. I did also add the Dulse but these do have the coffee grounds. They will be a bit darker than usual (due to the coffee grounds) and a bit more scrubby.
To prolong the life of your soap bar, simply keep it out of a puddle of water and in a well draining soap dish.