Artificial tree, not pre-lit, rather ancient but still holding up. This year it has one strand of multi-colored lights with a blinking/flickering/steady controller, and several strands of regular multi-colored lights. Dd thinks it's fun to drive the rest of us nuts by making half the tree flicker.
Ornaments: my childhood collection, the kids' collections (mostly gifts from grandparents over the years), and a couple that belong to dh. He doesn't have any from his childhood, and doesn't really care about getting new ones, which is why he has fewer than the rest of us.