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This is called a Dirty Pour project. That means blending different colors in different cups, then pouring them into 1 cup without fully blending before you pour.  The result is a flowing, mottled, stone-like effect which will vary based on 5 things:

1. The difference between your colors used, high contrast will create strong patterning.
2. How you combine the colors into the pour cup, if you pour thin, thick, or varied layers.
3. If you agitate/blend the colors in the pour cup before pouring into your mold.
4. How long you wait between mixing and pouring - the longer you wait the more distinct the colors will stay.
5. The way you pour into the mold. A smooth flowing pour will look very different than a thin stream pour.

This is all demonstrated in the video above.

Here's a quick video of the de-molding:

I wasn't sure what I wanted to make with these cast pieces, so I did some sketching:

In the end I decided on some simple stud earrings, so I domed up the backs of the smaller pieces with clear resin and embedded the post in it, for the very best possible hold.  The larger casting ended up as a cabinet knob!