1. The Good as a series of interlocking Laws - sin as law-breaking. This metaphor has become over-dominant, literalized and dangerous.
2. Sanctity as being turned-towards God, orientated towards God; sin as the act of turning away, damnation as being permanently turned-away from God (closed off, from pride).
3. Sin as a dark and opaque stain, marring the purity of white light - Tolkien's favourite metaphor. Used by CS Lewis to explain original sin spreading through humanity.
4. The Good as warmth and light, sin as coldness and shadow - e.g. Russian Saints who may survive extreme cold, and Saints who are surrounded by a glow.