The ingredients listed by the op are a pretty standard mixture and can be used in so many different soup preparations. Celery, carrots, onions, let me give you something equally good, but wildly different than what's already been posted, just to give you some ideas.
Creamy Potato Soup:
Ingredients:
3 medium sized russet or Yukon Gold potatoes
1 onion, any type (oh, be daring. Go with a red onion for color)
3 carrots, peeled and cut into 1/4 inch thick rounds
1 stalk celery, washed and sliced
5 tbs. butter
4 tbs. all purpose flour
1/2 tsp. salt
1 tsp. coarse grind black pepper
Scant dash of nutmeg
3 cups milk
Wash the potatoes and place into a pot of water.Bring to a boil and simmer until the potatoes are firm, but cooked. While the potatoes are cooking, saute the other veggies in 1 tbs of butter until lightly softened. Remove from the pan to a bowl. When the potatoes are done, drain, immerse in cold water (to cool them so they can be handled) then peel them. Cut into chunks and add to the veggie bowl. Combine the remaining butter and the flour in the empty sauce pan and place over medium heat. Cook until the flour just begins to turn golden. Slowly add the milk, while vigorously whisking until a smooth sauce is formed. Turn down the heat and add the veggies and seasonings. Let simmer for 15 more minutes over low heat. Taste and correct the seasonings. Enjoy.
I'll get back to this thread and give you more soup recipes you can try with the carrots, celery, and onions.
Seeeeeya; Goodweed of the North