Cut up your old soap using a cutting board and knife into 1/2 inch chunks. Weigh the chunks on the kitchen scale until you have 1/2 lb worth.
Make your 50/50 soap base. Blend until it reaches a light trace.
Add in your blue mica and blend again.
Add in your essential oils and blend again.
Sprinkle a layer of soap chunks at the base of your soap mold. Cover with a layer of the new soap. use chopsticks to swirl in the chunks.
Add another later of soap chunks, alternating colours if you have them. Cover in a layer of new soap, mixing in the chunks and filling up empty spaces.
Once the soap mold is full, top it off with flower petals such as centurea or bachelor's button.
Let the soap rest somewhere warm while wrapped in a towel for 48 hours.
Unmold the soap and cut it into even sections. Let the soap cure in a dark, cool location for 6 weeks.