I'm sure everyone could probably come up with some alternatives (esp. since "practical FX" means "anything that isn't CGI"), but I think all the candidates here are strong ones, from beginning to end.
The only two movies off-hand I'd add to this list are Silent Running and Aliens.
(h/t +James D., via http://www.blastr.com/2014-6-12/video-thing-star-wars-8-more-all-time-great-practical-fx-flick)
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I'd put Harryhausen's skeletons at #1.
Wait… Did he say "if you've never heard of Ray Harryhausen"? There… There are people who don't know this man's work?
I weep for the young generation.
Paging +cecilia FXX :-)
And Harryhausen FTW.
I think ITC studios deserves a mention for imaginative model work Thunderbirds, Space 1999).
Harryhausen is GOD 🙂
and the Lydecker Bros were f'ing awesome.
Personally I'm very impressed with the effects in Bladerunner
Too loud music, too silent voice. Dislike.