This is a picture of Celestia from the times of her battle against Nightmare Moon. I REALLY dont liked the idea that they HAD to carry the Elements everywhere with them when trying to use them. WHY THE HELL not to put them in armor? Not only it looks nice
but also allow you to focus on the fight, and not focusing on holding this crystals that accidentally you might drop. And what then? You gonna go back and search for it while your enemy is blasting you with magic? LAME! Especially if you have to follow your enemy, flying though narrow gaps, between trees or inside the castle.
I SAY NO to carrying the crystals. YES for armor WITH the Elements of Harmony INSIDE IT!