I've seen some very nicely done theme trees but while they look nice on display, they're just not *me*.
Our tree is traditional with colored lights, beaded garland and an Angel on top. Our ornaments are a mix of ornaments we've collected over the years. Many of our ornaments are from vacations we've taken so they carry a lot of fun memories with them. We also purchase one or two new ornaments a year to add to our collection.