Two from Harper Perennial's Modern Thought Series
Designs by Gregg Kulick
A fairly new edition (2008) of Heidegger's Being and Time, and the first design that strives to remind us this landmark work of philosophy was written in 1927.
And since it's been a really long time since I've read any philosophy seriously, I asked a professor buddy of mine what he thought of the big red X on the Wittgenstein cover. He offered two possible interpretations:
1. "There's the post-modern sense of undecidability with the X."
2. "It could be a variable (Wittgenstein will put you to sleep in X minutes)."
Ha! (More analysis / suggestions in the comments.)
Either way, philosophy didn't look this good when I was a student.

