All my first chicks were different breeds, because if I got all Rhode Island Reds, for example, then I was afraid I wouldn't be able to tell them apart. It would be like this, every morning: "Good morning, Rhoda!" "How are YOU this morning, Rhoda?" "Hey, pretty Rhoda, how are you today?" "'Mornin', Rhoda!" "Rhoda, how are YOU today?" etc.
I knew I would name 'em. I didn't know I WOULD be able to tell them apart until I got my first duplicates of the same breed, about 10 chickens into this venture.
I love a mixed flock. However, I do think there is a wonderful look with two different breeds in a flock, such as Buff Orpingtons and Black Australorps. Very Halloween-y.
The prettiest flock is one with mixed breeds, as far as I'm concerned.
Enjoy! And Welcome to BYC!!!!!