Generating a list of random permutations of another list

So, I'm trying to tackle the TSP with a Genetic Algorithm. To do that I need to create a population pool. What I wan't to accomplish is to create a list of random permutations that will represent a population pool. I'm trying to do this using random.shuffle. Here's my code that should handle that part. Cities is a list of cities and routes is where I want to keep the population pool (a list of N random permutations):

for x in range(n):
    random.shuffle(cities)
    routes.append(cities)

What happens is that it just appends the same permutation n times. Anybody have any idea about what I might be missing?