worm composter can be kept indoors or out. Fill the bin with bedding, such as shredded newspaper or shredded dried leaves. Place some sand/dirt on top, put your scraps in a layer in the middle then cover with more bedding/dirt. When you add new scraps, dig in a little then cover them up again. This design has two stacking units, but you can add as many as you want, depending on how much waste your family produces.
Cedar Outdoor Worm Bin with two compartments for easy collection of finished castings -- much better looking than the plastic models, I think. Simple, efficient design is a more natural fit for the garden.