check this blog:
http://diabolicmonsters.blogspot.com/
Its a collection of scans of an 80's sticker album from Spain called MONSTRUOS DIABOLICOS (Diabolic Monsters). Awesome illustrations.
check also this 2 galleries:
http://davidguy.brinkster.net/goaste/horror001.html
http://davidguy.brinkster.net/goaste/horror002.html
for more great monsters illustrations...