I'd post them on etsy for $35 and see how it fares. If it does "too well", you can raise the price", and if they don't sell, I'd lower the price by $5 increments.
This is a really neat idea though! I'd want the first one, because I like the shape and chain more, and that there's some green stuff! +1 for finding more chain varieties and colors, I personally prefer gold chains. Though I'm not sure how realistic that is... I don't know anything about buying jewelry materials.
That is super cool, I didn't know this!
ETA: Also I found similar little vials with greens and snake skulls, and they're going for $40 on etsy