Hi Katie, Challenge accepted!

I like this one, though it's not brass toned.

Ballard design tree topper

West Elm Confetti System Tree Topper

Another thought is to use a sculpture you already own or one you find on the internet and rig it to the top of your tree with some wire. I have never used a traditional store bought tree topper. (If your tree is artificial, the wire and thickness of the branches is usually plenty to hold something on the top of the tree.)