It still looks light grey but it reflects more of the surroundings, so it depends on your surroundings. Yesterday I parked the car near a huge building with green glass windows and the car looked a little green. Mostly the colour looks a little more white by itself in bright light conditions.
I have seen Neptune Blue several times and I love the colour, it's like the blue version of carmine red. I feel that chalk is more understated than neptune. It depends on whether you like being more subtle or more flashy (or if you prefer blue over grey).
It's the physics name for a system that pumps energy from one system isolated from another. In physics, "heat" means energy transferred by temperature difference. It's only misleading in the sense that people don't know physics :p