I made an awesome mobile for my best friends new babys room. and it turned out awesome, i wanted to keep it for my own apartment, and I don't have any babies. its perfectly chic, for anyone, any age. Here are the instructions and where i purchased the supplies.
I purchase the birds online here, and drilled small holes into them for hanging. Either you can find a branch in nature, or if you would like to buy one, check out Save On Crafts.