Jack The Giant Killer (1962) Clip
Sure, by comparison these stop motion creatures are crude next to anything by the hands of Ray Harryhausen, but they're still fun to watch!

And youtube user davidsytvid has put a lot of time into uploading a great variety of old science fiction and horror films. One of my favorites on the list is "Island Of Terror" starring Peter Cushing. Check out the plot.. "A small island community is overrun with creeping, blobbish, tentacled monsters which liquefy and digest the bones from living creatures. The community struggles to fight back."