I echo Sam's stargazers. They're my all time favorite flower and as she said they do really well in the house. They're exceptionally fragrant so I can't have them in the apartment, but I'd have no problem having them in a large house or garden room.
My favorite yard flowers are tulips. They stand so straight and tall, like proud soldiers. The range of colors is pretty amazing, too.
Oh and snapdragons. Just because I love to "open" and "close" their "mouths".