You can already get some (actually really nice) LEDs for your house that change color to lower temperature (more orange/red) as they dim, mimicking the effect of dimming incandescents. It does make for a nice cozy atmosphere. As you say, they're not cheap, but I'd consider them strongly if I were redecorating.

Edit: it's confusing that a cool blue light is a high temperature, and a warm orange light is a low temperature.