Nice thread. Now I can show the two picks for the last Music Trading Post where nobody reviewed my choices.

The theme was favorite covers...here's the two that I sent:
Chick Corea - Time Warp
Lords of Acid - Voodoo U
Moderator cut: image removed
As for worst, I realized that even though this album was my favorite of last year, the cover might be the blandest ever created:
La Roux - La Roux

Only thing keeping me from just falling asleep when I look at that, is the font they picked had that sorta cool lightning bolt looking thing coming off the 'r'.
(As for the poll, I picked the top option. Cover art, and even the inlay art can add so much to an albums personality. I could write a whole essay about how I feel about album art, but I might save that for my journal I think.)