Personally, and for some reason I can't explain, I always liked the way the hands of the Martians from the 1953 version of The War of the Worlds looked like: It has that cheesy '50s sci-fi alien look to it, but it also looks like an alien could really look like that. I dunno, I just always liked it.
It has to be... He has a glowing finger with Jesus powers for goodness sake! Also this cool toy, which was banned for some reason.