I love blue lights, too! Though I've wondered if those signify Hanukkah. If so, I may have to start celebrating Hanukkah instead, because I way prefer them to red and green.
Another thing I've noticed more this year is lights in a more limited palette of blue and green with a few reds -- but no yellow, orange or white. I find that color combination really striking. I also like just blue and green, or just blue and purple, or a couple of different shades of purple (that must be Prince's house).
There's this house near here that has those icicle lights hanging from the top of the front porch -- except instead of the usual white ones, these are beautiful cobalt blue. Then on the bushes below, there's a sprinkling of the limited-palette blue/green/red lights. It's beautiful. There's another one nearby that has a single tree heavily outlined in that limited palette. Also really nice.
Other lights and dislights:
1) Like everybody else, apparently, except the people who have them, I hate those huge plastic or inflatable figures. They're sort of the decor equivalent of corny Christmas letters.
2) I used to really like the all-white look, but I think it's been overdone. I did see one all-white house I thought was pretty original because, it emphasized different textures: icicles and regular lights and little snowflake-shaped lights, strategically placed.
3) I think in general I prefer outdoor displays that are a bit underplayed to those that go way overboard. But those way overboard ones are undeniably riveting. Anybody know how much that kind of thing adds to the electricity bill? Do you feel it's frowned upon in these environmentally-conscious days? What if you went way overboard -- but used all green lights?
4) In lights strung on deciduous trees, I much prefer the ones that follow the outlines of the trunk and branches rather than those that are strung horizontally from branch to branch.
5) For tree lights, I'm kind of sick of those ordinary little lights you get at Walgreen's or Target, but they're so cheap and readily available they're hard to resist.
BTW, the questions above are meant as a guideline or jumping off point. You're welcome to answer them individually, but this isn't a survey format, so don't feel obliged to follow them exactly.