The biggest problem is that they're narrow-necked, which means putting any organizational use to them is a no go.

Infusing vodka? Use them as salad dressing dispensers?

I have a big vodka infuser already, although salad dresing ...maybe. Hmm, that requires a drip topper.....hmm

I store pantry goods in narrow-necked glass bottles: cornmeal, rice, lentils, anything that I can pour through a funnel. It keeps them well sealed and allows me to pour the right amount into a bowl or pot or measuring cup without sprinkling all over.

I also use well-scrubbed clear wine bottles as in-home water bottles; I love having a cold bottle of water already in the fridge, and when company comes over, it looks a little prettier than a plastic pitcher.

I used to use a glass bottle with bar-style spout for dishwashing liquid, which looked SuperClassyTM, but my husband never registered it as "soap bottle" so he kept buying more bottles of dish soap. I gave up.

I filled mason jars with a water/vinegar/food coloring mix and put them on a south-facing windowsill so that the sunlight comes through them and lights up the living room in different colors.

Look who thinks he's Martha Stewart now.

I have one that I use for iced tea

The size and shape are what's stopping me, I can't think of anything I need that much of in one place, although grains are a good idea.

I also use well-scrubbed clear wine bottles as in-home water bottles

Now that is a good idea and I will imitate. I think this would also be nice with green bottles.

I used to use a glass bottle with bar-style spout for dishwashing liquid

Another birthday-twin coincidence. I use a vintage soda bottle with spout for dish soap.

I've been saving bottles with stoppers for my homemade vinegar project. Only problem, my first batch of vinegar failed to...vinegarize? But that just gives me more time to accumulate good bottles with stoppers. Whiskey bottles are turning out to be good options because so many of them come with a combination cork/wood stopper that's really easy to reuse.

Other thoughts:

-Bubble bath?
-Herbed vinegars? (Stick some rosemary in there, cover with white vinegar)
-bath salts?
-Fill with water and freeze as cooler ice packs? Or just to help your freezer be cold?
-flower vases?
-

Vodka + vanilla beans = deliciousness. The longer you leave the beans, the darker and more syrupy the stuff gets. Beats the pants off storebought essence.

Fill them with a combination of gasoline and soap flakes. Then wipe your fingerprints off with alcohol. Then put a tampon soaked in alcohol into a plastic bag and tie it to the bottle with a rubberband. Light the plastic bag and when it's burning well toss it at a Chick-fil-A building when nobody is working there.

That was a joke. Just kidding. Fill them with colored sand.

Really.

And no gasoline.

I'm drunk. Ignore me. Please.

I also use well-scrubbed clear wine bottles as in-home water bottles; I love having a cold bottle of water already in the fridge, and when company comes over, it looks a little prettier than a plastic pitcher.

This is a simple yet elegant idea that (like Miko) I am going to adopt. I currently have a rather pretty bottle of Hendrick's Gin on the go, and I would be pleased to find a new use for that bottle; it's too nice to recycle.

Tune them.

I use a plastic honey bear for dish deterg. Dunno about classy, but it's cheerful.

I just like pretty bottles. if you can find some tiny fairy/ party lights to put in the bottles, they're nice on a porch.

I filled mason jars with a water/vinegar/food coloring mix

Okay, I'm curious about the vinegar. Would water & food coloring alone get moldy or funky in the sunlight? Or did you decide to follow Easter egg protocol, just because?

if you can find some tiny fairy/ party lights to put in the bottles

I've seen that done and it really does look beautiful, but when I tried it, the bottle got really warm to the touch. I started worrying about my twinkle light strings melting/catching fire/insert terrible consequence here. Am I using crazy-powerful twinkle lights or something? Or am I just a big worry-wart and they would have been fine?