Sunlight or any source of natural light.
Bright or cheerful colors.
Signs of innocence or purity.
Symbols of hope or happiness.
Anything that suggests goodness or benevolence.
Clear skies or scenes of serenity.
Symbols of love or compassion.
Natural landscapes or flora.
Smiles or expressions of kindness.
Anything associated with joy or laughter, ugly, deformed, noisy, blurry, distorted, grainy