Wings should work as follows:

Good: Angelic/shimmering wings
G/E Neutral: Bird-like wings
Evil: Bat/demonic wings

Chaos: Comprised of swirling/shifting energy
L/C Neutral: No additional effects?
Law: Metallic/reflective

Alignment aesthetics are cumulative and stack, so Chaotic Evil wings would be Demonic and made up of shifting energies.

Wing colour: Selectable at creation