I’ve not got a lot of time today, and definitely none for searching the internet for book covers I dislike (most of the books on my shelf are at least tolerably decorated), so I’ll default to Capillya over at The Broke and the Bookish. She did a great job of finding some prime examples of awful covers, and she hit most of my main dislikes.
Of course, if that's not enough, fifty-nine other people have currently added theirs to the blog carnival. Party on. :)
Enjoy the rest of your Tuesday!