The poster art is nice, but as someone who's liking the work of Drew Struzan less and less by the poster (to this day, I think the "Harry Potter" poster was completely botched), if I had to have an alternate, the novel artwork would definately be the way to go. Heck, I practically prefer the novel's cover, just because I feel it does a better job of implying the story's plot.
Wait, scratch that. The Teaser posters!!!!!
I would hope they would follow the design scheme set forth with the TPM DVD, only with black font on white background, rather than white font on black background. This would also fit well with the last VHS release.