Those look very nice. It is my understanding that you can use any type of soap. I have yet to try it, but I am saving my bits and pieces of shades of green to use with some Irish Spring. I really like the crescent shaped ones.
Okay, I'm sorry, but I have to say this is my FAVORITE secret EVER that I have received. I looked at it and I was like, you know what.. they are absolutely right. I myself plan on being cremated and never could find a downside until now. I am going to be so sad when I miss the fun!