Here is a little soup I basically made out of nothing. It is not much of a looker but it tastes pretty good. In fact, John took a spatula and ate the last drops out of the food processor!
Saute a half medium chopped onion and a garlic clove. When the onion is translucent add 3-4 cups of vegetable odds and ends, one medium waxy potato, and 2 cups veg stock. For the vegetable odds and ends I used broccoli stems, a piece of leftover fennel, some green onion, two celery stalks, and the stems of two bunches of parsley. Cook until the potato pieces are done and it is ready to go in the food processor or in a blender, if you want a more puréed soup.
I served mine with a swirl of yogurt but if you want a vegan experience, leave it out. The potato makes the soup creamy and your vegetables dictate the color. Serve hot, room temperature, or cold.