As found on Metafilter: the Mars Attacks Picture Gallery — not about the movie, but about the original early-60s trading card set. The cards were deemed too violent and gory by parents of the day, then pulled from the market. If you had a set of these cards now, they’d be worth a lot of money.
The gallery is part of this Mars Attacks fan site. The pages may have circa-1995 web design, but the cards and their story are kind of interesting.