I think they're lamps made out of beer bottles (just with no lightbulbs installed yet, they'd sit in the top).
For a minute I thought these were carbonation savers, special caps for fizzy wines that make it so they don't lose to much bubbles over night.
Which didn't catch me as very redneck
Further context for those outside US:
The bottles are from two of the most common, cheap domestic beers, which can be found everywhere but are strongly associated with low-brow party culture of the suburbs and the holler (tailgating, barbecues, etc). Like, if you order one of these at an upscale place, it’s probably either to signal approachability / lack of pretension or because it’s the cheapest thing on the menu.
Also making do with what’s at hand, aka “redneck engineering,” is a meme in its own right.
Edit: not turning my nose up, to be clear. (Though if I’m picking up a case of cheap beer, it’ll be PBR or Schlitz if that’s still around. Maybe non-light Coors.)
If you were going to do that, it seems like you should fill the bottom half with cement or something - otherwise they'd be top heavy.
"Get it? Light beers! Daryl, come look at these light beers, they finally found a use for em."
Classy af to be sure, but wouldn’t work without a base to keep it from falling over. My cats love to launch themselves around, mostly when I am asleep and would certainly destroy these beauties.