I'm so pleased with how this turned out! The pictures don't do it justice (and the walls of the room aren't gray - they're a very, very subtle sage green. So subtle that anyone with normal vision would call the color cream).
I used the free bird softie pattern from Spool, scrap fabric, and a branch from our backyard. The birds are kept in place by that demi-god of the crafting world, hot glue. The branch is hung from the molding with near-invisible fishing wire.
The Spool pattern shows the birds made into a mobile, but this branch worked better for us. I wanted it to be a more permanent artistic feature of the room. I have this thing about mobiles - many people consider them permanent fixtures in the baby's room, but I see them as being changed with some frequency according to the baby's development. I have a whole set of developmental mobiles that I'll be making for the little guy. They're patterns I got from a friend of a friend of a friend's Montessori Assistants to Infancy album. I'll share them here as I get around to making them.
I'll leave you with our current favorite song - one that I sing to the little person in my belly every day: The Littlest Birds by the Be Good Tanyas.