I've never been very satisfied with the results when using embossing powders on polymer clay. Having a huge stash of embossing powders though, I thought I would try them in clay. I love the results and I love not knowing what you are going to get in the end - check out the pictures below and see how different the unbaked and baked versions are!
Before on the left, after on the right.
Before in the middle
Mixed from all the scraps. I actually prefer the back of the pendant (bottom right pic)!
I think they will look even better in some jewellery.