Even a very simple RGB star can give you options in the future. You could just program it all for 100% R,G,B the first year, set for string mode or something, then its only 3 channels.
Still easy to do colors in LOR or vixen with.
A simple cross or sphere is the easiest. Those acrylic light fixtures, when you put a few modules into them ... are rather nice and simple put a lid on it and its an easy topper.
I have a more elaborate start topper design, but isn't what I'd call a simple star.