I remember that I watched this movie as a kid, probably in the late 70's - early 80's. I think it was a black and white movie. I believe the story revolved around an outbreak of creatures that were roughly 1-2 feet in diameter, would cling to walls and ceilings, and their touch would kill.
They reminded me very much of some aliens from an old Star Trek: TOS episode, but these may have been lab created rather than aliens.
I do remember there was one scene where some of the main characters were trying to move through a house with these creatures covering just about every surface. Being an old movie, there wasn't much in the way of special effects for the creatures. From what I remember they looked pretty much like pieces of plastic, and they may have quivered slightly. I don't remember for sure if they were mobile, but I believe they could either drop from heights or crawl extremely slowly.