Two questions please.
1. Can you point me to a tutorial for making a box lid? I have made one bfore, but am sure I did it the hard way.
2. Any tips on creating Tiffany blue?
Not A hundred percent sure but i think it is sky blue and a hint of teal. I made mine, not the best (without teal). As for the lid, let an expert help you. for mine i just placed a band of fondant around the top. some people use foamcore for the top covered in fondant.hth
For the box lid, are you looking for a closed box look or an open box look? There is no right or wrong way to make a lid, just a lot of different ways.