<Christmas Blue Theme> 
1. Frosty Blue - 
                            
                            #A1C6EA
                         - A soft, pale blue reminiscent of winter skies. 
2. Midnight Blue - 
                            
                            #003366
                         - A deep, rich blue that evokes the calmness of night. 
3. Snowflake White - 
                            
                            #FFFFFF
                         - A crisp, clean white that symbolizes purity and freshness. 
4. Icy Teal - 
                            
                            #009B9F
                         - A cool teal that adds a touch of modernity and warmth. 
5. Silver Glimmer - 
                            
                            #C0C0C0
                         - A shimmering silver that represents elegance and festivity. 

This color palette combines various shades of blue with complementary colors to create a serene and festive atmosphere suitable for a Christmas card. The blues evoke wintery feelings, while the white and silver add a touch of brightness and elegance.

Would you like to explore specific design elements or motifs to incorporate with this color palette?