Once you get a couple of these lids stuck together, you can never get them apart again. They trap the air between them, creating a vacuum of sorts. I got to thinking that you could easily use one of these to pot a plant. And you could use two of these to pot a plant, with a water trap in the bottom. The reasoning for the lower chamber is to catch the excess water that leaks through the soil. In doing so, you will keep from over watering your plants. Also, you will see just how much you are over-watering them, as you will be able to see the water trapped below. That water should dry up. And if there is no indication of moisture in the bottom, it may be time to water your plant again! We will call this contraption the "plant buddy" on account that you should not over water and kill whatever you grow in it.
What soil shall we use? Many smart people are finding that you can compost your own materials and come out with better soil than the stuff you pay high dollar for at your local home stores. We won't need a lot of soil for our small pot. Composting is science. You need the right amounts of the right materials, in the right temperatures to come out with good stuff. You may not want a rotting garbage can of waste in your yard while you experiment. Hence, the "My Little Composter". A see-through container where you can compost your materials in small amounts. My kids took an interest in this project which made me think that this would make a great future science project.
We started with three containers of various sizes, and the matching inter-locking bottom pieces.
Step 1: Stick your lids together, and drill some holes
Pushing your knife inward, make a series of small holes. This will allow the water to seep to the bottom of the soil, and make it's way into the bottom chamber where it will dry up.
Step 2: Push the lids together
Step 3: Clip off the extra tab thingies, and add soil.
Next, add your soil and seeds. If you plan on keeping this soil moist for new seeds (germinating) why not also add an earthworm? He will appreciate the new home, and you can appreciate what he does to your soil. You might also catch a glimpse of him moving around since the sides are clear. Make sure you use distilled water for healthier plants. If you want to use tap water, let it sit in a jar for a couple of days to let the chemicals evaporate.
Any old soil might due, but wouldn't you rather use some freshly brewed composted materials? Let's get working on the composter next.
Step 4: Build your composter
Your base could be made out of anything. I went into my garage looking for old coat hangers, but I found some old wire that I had kept from a political yard sign. That stiff wire is great for a multitude of projects such as this one. With some pliers and a hacksaw I was able to get exactly what I needed.
My base on this project is rather narrow, as I used a small container. Those containers that come with 100 or more CD/DVD's in them would make a nice little barrel composter. But the base would need to be a little wider to accommodate for the weight.
We will want to make a few more modifications. See the next step.
Step 5: Put some holes in your composter tub
You will need to poke some holes in your tub. Not too big, we don't want the stuff falling through the holes. You might want to use the steak-knife technique here so that you can control the size of these holes.
Commercial grade composters sometimes have holes through the center too. So you could even drill some small holes through the dark plastic tube that centers this whole job.
Step 6: Mount the composter, draw your line
If you have a bunch of these containers, you might create a whole line up of little composting units. In doing so, you can experiment with different materials in small amounts and then move up to a trash can sized job once you have the process down.
Check out the WikiPedia page for more information about composting, and some useful links to help you along.
Composting on WikiPedia
Feel free to chime in with suggestions, comments, or other such goofy ideas.