So far you've made Yin-Yang, Butterfly, Celtic Knot, Peace Sign (circle), Peace Sign (hand), Tree of Life, Dragonfly, and Bees. And I love all of them!! Very pretty and well made! I can't wait to see what you come up with next.
As to your question on the theme, I think the butterfly, dragonfly and bees will work. They can represent a love of nature, flying free, peace, and serenity. All of these are part of the Hippie movement.