What are your favorites? What didn't work for you?
I'm a sucker for gimmick covers, in general, but the "invisible" image in the gloss of the dust jacket of the Invisibles omnibus fills me with geeky delight, whenever the light catches it right.
And, I love glow in the dark covers, because I tend to forget they are glow in the dark until they randomly shake me up in the middle of the night.
I still don't know how Force Works #1 is supposed to work.