Add the Epsom salt, baking soda, and coarse sea salt to a large mixing bowl. Stir to combine.
Mix in the dried lavender buds or other dried florals, if desired.
Add 10-20 drops of your favorite essential oils. Stir thoroughly to evenly distribute the scent.
If adding color, drop in food coloring one drop at a time and mix until the desired shade is reached.
Spoon the mixture into an airtight container, leaving a little space at the top for easy sealing.
Seal the container and store in a cool, dry place.