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For the Yellow (Lemon scented ) ones, I wanted to try slightly embedding the soap slice. I left a little space at the top of the mold when I made the bases, and once the soap had a nice thick skin, I sprayed it with some rubbing alcohol and added a little more melted soap. You can see from the photo I kind of overfilled the mold, I was going for a kind of messy look, which I thought would look more like frosting. Then I added the yellow soap slice.
After the soap hardened and I took it out of the mold, I did rub the top down with a clean, dry dish cloth, just to smooth off a few little bubbles. I prefer the soaps with the slice embedded but both ways are really fun and easy to do.
Thanks for looking!