Hi please check the link for idesa:
You can use small round tip to make the bird’s nest using buttercream icing and tiny fondant birds or eggs
https://www.google.co.in/search?q=bird+nest+cake&tbm=isch&tbo=u&source=univ&sa=X&ei=WCwgU6SfOci4rgfMmYCoAw&ved=0CCUQsAQ&biw=1242&bih=577
Hope the info was useful
