There are tons of original ALIENS
art pieces posted over at comicartfans.com
Type in ALIENS or Predator to see the original art pieces and click the thumbnails for bigger high rez pics of the art. There are a bunch of pretty cool old comic pages in b&w too. Some nice covers too without the original comic logos and titles.
There're even Star Trek/Aliens comic art pages in there. Was that a once planned/proposed series???