To keep curved walls while modernizing an 80s house, preserve their shape but update finishes with light, neutral paint colors to brighten and refresh their look. Enhance natural curves by adding layered lighting such as recessed spotlights or curved track lighting that highlights these architectural features. Avoid flattening or removing curves, as they provide unique character. Maintain flowing flooring that follows the curves for cohesion. This respects the home's original personality while presenting a contemporary feel.