((Peach? Oh that's awesome. *giggles* I like the fuzzy bits on his skin. That's adorable. X3 However, if the soul is a peach, then you may need to draw from the peach tree. I don't think the peach is considered alive once it leaves the tree. I like the idea though. X3
I like the Capricorn idea as the soul for your Crystal Mercury. It's something different and has a good base for balancing your essence/soul. :3
Hmm...for the wolf, if you want to tie in the moon and time idea for an essence, maybe make an essence based off of the Equinox or Solstice? Both mark a special time in the cycle, and are celebrated by many mythos and religions. Maybe a fragment of an Eclipse as well.
The Pyramid is interesting. X3 Is it a living thing? Just curious.
*pyramidhead puppy, muahaha!* A soul with sand...well, the sphynx was already claimed, maybe a scarab. I know it's not made of sand, but most things that are made of sand wont have a soul. I would also recommend
Thoth; he's the God that weighs the souls of the dead, and who keeps the balance of good and evil. :3
I really like your layout! XD Keep up the great ideas!))