I would imagine that if you steamed breast milk, you could use that to make an awesome cappuccino. It would taste different since breast milk is so much sweeter than cow's milk, but I bet it would taste really good. It would steam up quickly too since it's already warm.
The last thread occurred to me as kind of a random thought. This one occurred to me while reading the last one. The next one will have occurred to me while reading this one. It might be worth mentioning that my wife is lactating.