It always seems like a pity to just recycle perfectly good watertight bottles without giving a go at what else I can use them for.
Maybe I could use them while painting. If I mix a good color, i can just seal it up and continue to use that color next time (so it won't dry out) I could even put a dab on the outside so i know what color it contains.
We also started using them for coins, Pennies, dimes, nickles and quarters in their own bottles, and kept in the car for laundry runs/toll roads/filling water bottles.
In my travel bag I have qtips in the small ones, cotton balls in the woder ones, toothpaste squirted into one, liquid soap in the baby-seal ones and even mouthwash in one.
I will keep plugging away. :-)
When I do end up with more bottles than I can use, I put them in a large ziplock, write craft supplies on the bag with a sharpie, and give the bags to Goodwill.
I make sure to take off prescription stickers first, unless they are simply vitamin bottles.