I must have tried every Sally's in Glasgow in an attempt to get my hands on China Glaze's Halloween
Collection for 2012 which is dubbed the Cast A Spell collective which boasts 6 shades:
Make A Spectacle, Immortal, Bizarre Blurple, Glitter Goblin, Cast A Spell and Roguish Red.
In the end I gave up and ordered the two shades that spoke to me the most from eBay.

Cast A Spell
This shade is far more beautiful than the photos let on, it is a deep murky green with a golden duo chrome
which is created by flecks of deep green and a dull golden glitter.
It is one of those shades you need to see in person to truly appreciate but it is by far my favourite 
from the duo I picked up and as the glitter is so fine I found it a breeze to remove.

Glitter Goblin
I want to like this shade - a mix of red, silver and holographic glitter particles suspended within
a clear base, it is jam packed with glitter but is more suited to Christmas than Halloween
and is not as special as I anticipated but does look nice enough over a red base.

As mentioned I picked these up on eBay for just under £5 each (inc p&p) - link 

P.S No nail swatches for a few days as like the idiot you all know me to be I had a little
hit n run accident with a knife while carving a pumpkin...nothing serious but a cut finger
does look pretty grim despite it being pretty on theme for the occasion.