Answer:
I can be simple or I can be complex. I can be found in this riddle or in everyday life. I can be shapes or even colors.
What is the difference between a poorly dressed man on a bike, and a well-dressed man on a unicycle?
Though not a plant I have leaves. though not a beast I have spine. Though many wouldn't need me I am more valuable than wine.
Tear off my skin. I won't cry, but you will. What am I?
Fashions change, but what can a person wear that is never out of style?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?