Kale and White Bean Soup: Kale, white beans, salt pork/bacon, onions, garlic, celery, carrots, seasoning, and veg stock or chicken stock. I cook the bacon/salt pork down first, remove from pan, throw in onions, celery and carrots and cook a bit, then throw in the garlic. Cook until fragrant and add kale. I normally season any dark greens with nutmeg. Season if needed.
Broccoli Cheese Soup: Broccoli, onions, garlic, celery, maybe some carrots, chicken stock, cream or milk, nutmeg, salt/pepper, and cheese. I've used combinations of parm and cheddar, romano, and even american cheese in a bind. To ensure the cheese doesn't break, I normally make a roux and cheese sauce in one pan and then add into my big soup pot when everything else is cooked. It is a bit extra work, but ends up better for me. Plus--extra cheesy goodness to lick out of the bowl!

I blend it all together with an immersion blender at the end.
Those are two of my favs. I agree with the pp that soup is pretty much anything I can throw together. The other night we had left over taco meat. I mixed that with some salsa, beef stock, onions, garlic, celery, carrrots. It was great. I normally have a pot of soup in the fridge every week, and freeze a portion for a quick meal when time is short.