Harry Potter:

Gryffindor nail ‌ is full of courage and adventure. The design is usually dominated by red and gold colors, symbolizing bravery and passion. Patterns may include lions (the Gryffindor symbol) and flames to give a sense of warmth and energy ‌

The Slytherin nail ‌ represents mystery and wisdom. The design is dominated by dark green and gold, with the dark green symbolizing the scales of the snake (the symbol of Slytherin) and the gold adding a sense of dignity and luxury. There may even be a snake design, detailed to such an extent that it appears to have been created by magic ‌12