I seem to be doing a lot of 2012 threads...anyway, Pitchfork have had their say here: http://pitchfork.com/features/staff-lists/9014-the-best-album-covers-of-2012/

Agree with some:
Beach House - Bloom http://tinyurl.com/bg8vfxc
GY!BE - Alelujah! Don't Bend! Ascend! http://tinyurl.com/d586dqm
Tame Impala - Lonerism http://tinyurl.com/cbnko5u

Plus:
Port St. Willow - http://tinyurl.com/c2od4cq

Please include both a link and the album name. To help reduce clutter, we could use http://tinyurl.com/ to shorten the lenght of image links.