The avid composter can buy a pyramid-shaped compost bin, but a hardy do-it-yourself-er can create one simply by piling up moist worm bedding and a bit of soil into a pyramid shape and taking care to keep it covered and moist. It's a good idea to create your pyramid-shape inside a plastic bin of some sort to keep the compost neat and tidy, but there's no need to find a bin in the actual shape of a pyramid.
Shred newspaper into long, thin strips. Do not use newspaper with colored ink. Shred cardboard into small pieces and mix with the shredded newspaper.
Soak the shredded newspaper and cardboard in water and press the water out until the newspaper and cardboard are wet but not dripping.
Add two cups of garden soil to your damp newspaper and cardboard and mix thoroughly. Mist with a spray bottle until damp. This is your bedding material.
Form the bedding material into a pyramid shape inside a plastic bin. Do not pack down or press the material into the pyramid shape.
Add earthworms to the top of the pyramid. Add some scraps of food from your kitchen. Do not add citrus, onions or garlic.
Drape a damp cotton cloth over your pyramid to keep the it moist and dark. Spray the cotton cloth with your spray bottle whenever it begins to dry out.
Find a place to keep your pyramid compost bin for your earthworms that is relatively dark (out of direct sunlight) and warm (between 65 and 75 degrees F). Keep the bedding and cloth covering damp but not wet, and add new table scraps whenever the previous scraps have disappeared.