I think Angry Birds is definitely a favorite to bring to life! There are many ways to do it using things you have laying around the house from big to small.
Here is one with cans from Kims Kandy Kreations
A big sling shot tutorial on Tim and Meg
I love how Lazy Mama Designs made these Angry Bird Blocks out of Capri Sun boxes
A great life sized version from I Believe in Love
An even bigger launcher tutorial from She Knows
Or you can make some less dangerous paper birds from Little Plastic Man