want to super charge your blend?  add a crystal as your rollerball.  you can add one of the following:
 
rainbow flourite: all chakras, energy cleansing, mental clarity, auric field repair

labradorite: all chakras - protection, intuitive abilities

african bloodstone: heart, root and sacral chakras - courage, endurance, purification, strength

clear quartz: all chakras - clearing, memory enhancement, amplifier
 
rose quartz: heart chakra - gentleness, stress release, love, emotional healing

black obsidian: root chakra - cleansing