Thanks for all the wonderful guesses and ideas!! Most of you guessed one of these correctly (the obvious one...). Here are the guesses from yesterday:
pink or rose clay
Clue for today: One of the soaps is coloured with a combination of two of the guesses from yesterday and another of the soaps is coloured with something that has not been mentioned yet.
Keep the guesses coming!!! What we'll end up with is a fabulous brain-storm of natural colourants for these shades!!