Don't think it's been mentioned yet, but Nightmare on Elmstreet 3 has a shot of Ira Heiden's soles in socks, and Nightmare on Elm Street 4 has Rodney Eastman (The mute kid who was also in NoES 3) barefoot on his waterbed, and you see the tops. He shows his soles too, but it's too dark to see anything.
Also, Saw 1 has Leigh Whannell barefoot, though it's been a while since i've seen it, so not sure how good the scenes are:
http://www.webwombat.com.au/entertai...ages/saw-2.JPG
http://l.yimg.com/eb/ymv/us/img/hv/p...annell/saw.jpg
The Lost Boys has Corey Haim barefoot in the bath i think. There's also a deleted scene with Michael Patrick putting his sock on or something.
The Black Christmas remake has Robert Mann running around barefoot a lot as Billy Lenz.
Dunno if it counts as 'Horror' or something else, but Jaws 2 has a great, if brief, scene where the boat is rammed by the shark, and some guy named Eddie falls backwards into the water.