Melt oils and cocoa butter to 115°F over low heat.
Make your lye water by combining lye and water in a heatproof glass. Stir until dissolved and then cool in an ice bath to 115°F.
Slowly add lye water to oils in a large bowl. Blend until it reaches a light trace.
Add in essential oils and blend again.
Add the spirulina powder to one side of the bowl. Use a spatula to make small circles along the edge of the bowl until the powder creates a dark green circle around the edge of the bowl. Pull the dark green through the soap once or twice.
Sprinkle dried calendula and parsley on top.
Pour into soap mold and move somewhere warm for 48 hours.
Cut into equal sections and let soap cure for 6 weeks before use in a cool, dark place.