Beautiful work!  I am trying to achieve that color blue buttercream and have not been able to  :(  Any help on how you got this color would be most appreciated.

Hi there!  Thank you for that nice compliment!  I have several ways to make dark/navy blue.  If you like chocolate, it's a big help to start with chocolate icing.  If you want vanilla, you just have to use more food color.  I use Wilton paste colors.  I use a combination of black, royal blue, cornflower blue and purple.  Keep adding color until you get the shade you want!