If you love the look of glitter on soaps but don't want to use it, Snowflake Sparkle mica is a great and less expensive alternative. Adding Snowflake Sparkle to the tops of soaps will add a glitter effect, but without the potential scratchiness.
For just a touch of sparkle, this is so nice
I love this glitter
One of my favorite so far
I use this mica on several of my bath bombs. It adds a nice bit a sparkle.
I will never be without a good supply of the snowflake sparkle.