Those are all beautiful.. I'm really digging the crystalline one, it's very spice-like for me, especially if we can make it reflect in a certain way. Like very piercing reds, blues and greens. Like a very shiny crystal prism. And the tint would also change further away from the center. I tried to find some pictures to explain what I mean.. A bit like those but in a more sparkly magical way.
And as for the mayan, maybe it could have a color scheme like this, I dunno:
I can't think of colors for the ornamental one yet..
Also here's a few variations on the face because I thought it was a bit intrusive the way it's looking at you :surprised So maybe the sleeping one would be better, then it could also symbolize the fact that you're about to wake it up by opening the lock. Also made variations of the glyph stone sizes so they would be more recognizeable. Just mix and match any elements you like, I'm not attached to anything.
EDIT: Here's more random ideas. If the key is gold then the lines connecting the rubies could be silver, and the labyrinth patterns could be just holes that are cut through the key (they would have to be a bit wider).
And your mandala could have the last layer of petals that are twice as frequent as the other ones, so it would look more round. And the shadowing could be stronger.. A kind of strong mystical shadowing of petals/scales/feathers is VERY spice-like for me.
EDIT2: OH, and if for some reason this ever gets made into a sticker, then the crystal could be like a hologram surface, and the gold and rubies a shiny surface too. I can see it clearly in my head and it would look so awesome when you move it around! :want: .. Or maybe I'm getting ahead of myself here.