I love love LOVE Elderberry. I don't think the pictures show the full goodness but at least you can get the idea. (Also, this is post-hair-washing, so the fault is entirely mine about the slight chipping going on there!)
Then last night, since it was chipped, I switched to Slightly Unstable, which is limited edition and which is described on Etsy as "a black crelly polish with a green-yellow-silver shift and scattered holo particles" - I wasn't sure what that would mean in real life but I thought it sounded interesting! So far, I read it as a green holo, for the most part.