There are many design projects your can so with empty glass bottles. You can just build a bird feeder, which can be filled once in every few days.Try placing artificial flowers in the bottle to add a bit of glamour to your room.
You can even use a simple bottle made as a basis for construction of an improvised bedside lamp. Just throw a small amount twinkle lights inside and glam it up.
Funny composition of different-sized bottles can become an organic part of the winter garden. The combination of green plants, stones and colored glass unwittingly attracts the attention of every person.
You can see even more great DIY ideas here.