Though we did start our little girl off with sippy cups, she has always used "real" bowls, plates, and silverware (appetizer forks and spoons).
Though I mainly did this for two reasons - practicality (children's things don't seem to work as well... especially the utensils) and beauty (children's things in our price range are ugly) - I have found that there are some other benefits as well. For one, our little girl is very careful with breakable things. Additionally, I was practicing Montessori concepts without realizing it!
After searching around a bit, I was able to find some 5 oz juice glasses for our little one to use instead of her sippy cups. As you can see from the pictures, she's loving these little glasses!!