Well this is EXTREMEly difficul choice to make... (yes I know,but no one did it so...).

So my top 2 would be:
The Shores of Limbo by Lukc: for the original idea and realisation (I'm not specially a fan of BOC though)
The Burning Lands by Sapiento: very nice realisation, style and colors

My special others:
Sunrise Over Boreas by arsheesh: sober and nice
Muspelheim by vorropohaiah: for the 'crack effect'