I was thinking about this just today. I'm all for incandescent Christmas lights and they are the only ones I use, but...
What if you absolutely wanted to use LED, could you do the following to have at least a close enough appearance ?
1. Build a plug in rectifier box to eliminate the flicker.
2. Get a set of lights that are either warm white or anything yellowish.
3. Find some translucent paint in different colours to paint over the "light bulbs" that are only clear plastic that doesn't heat up.
Maybe you would have a bit of that "festive warm glow" you get from standard lamps...
Just a thought...
just dip the blues ones in some glow in the dark paint the flickering will stop and they will glow a bright green color and remain lit during a power outage for a while..
And if you cut the set up they can be wired to run from low voltage DC, I did this with a few sets so I could power them from an old car battery at the end of the driveway and I didn't feel like running like 400 feet of extension cords out there, they actually work pretty good and a car battery will drive them for weeks between charges ( I could of gone a good month if it's wasn't -30 out and had to deal with a loss of battery capacity ) there is no flicker at all and they lasted unlit the lead wires corroded, why they can't make them waterproof is beyond me or at least use corrosion resistant leads...