I came across a blog post a while back where a guy drilled several holes in the bottom and sides of a 5 gallon bucket, "planted" it in his garden, added kitchen scraps and surrounded it with tomato plants.
I wanted to try this in my garden but I didn't want to use a 5 gallon bucket. That would be way too large for my small garden space along the deck. I decided to use 1 liter bottles.
I made holes in the bottom and sides big enough for worms to get in. Then I cut the top off the bottle so I could invert the neck into the base as a "cover". This would allow water to get in and was removable so I could add more kitchen scraps as needed.
The 1 liter bottles don't take up too much space in the garden - basically the space of a little potted plant.
I'll "plant" two more of these tomorrow and get some mulch from up the street to complete this new garden bed of tomato plants!