i love that last etsy necklace! vanessa have you checked the usual suspects like express (people stylewatch mag said they had lots of fun jewelry this season), BR, NY and Co, J Crew, limited, F21, Target, etc.?? i think your best bet is to find something cheap that looks similar and then layer like 3 or 4 of them (but i'm sure you thought of that already).
People on Etsy are usually really nice about doing custom stuff - if you found one there that had the vibe you were looking for, I'm sure you could send them your inspiration pic and see if they could remake it for you.
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To be yourself in a world that is constantly trying to make you something else is the greatest accomplishment ~ {Ralph Waldo Emerson}