Keepsake cakes is an idea of Diane's to have a remembrance of the special occasion to keep as a "keepsake".

Rolled fondant is used to cover the styrofoam fake cake.  
Impressions are used on the above cakes to create the designs.
The Santa Moon design is made by pressing a foam stamp into the fondant.  
The different sections are handmolded to create the "fill-in" method.  
The fondant holly and berries are added to the top for a nice touch to the design.   Petal dusts are used to tint.  
The Santa hat, holly and berries are made from colored fondant.  
Peqrl dust or satin dusts are used to create the "Satin-look".   
Diane used her wooden tool to create the impression border.
"L  ove" is created by poking the point end of a tool into the fondant.  The pointed end of a round toothpick may also be used.
A mini heart-shaped cutter is pressed down into the fondat to create the heart.