The bottom pic looks like the plain (non-cultivar) species, many pics right on this site, though there are some pics of cultivars as well.
Snake Plant (Dracaena trifasciata)
Gene, what an amazing collection! If adding some pics to the database sounds like fun to you, and your schedule permits, more pics are always welcome. Or, you could post pics amid any discussion with the name(s) and invite others to associate them with the proper plant for you, in which case you and the person who creates the association each get an acorn.
