Do you want it to match your decorating theme? Your climate where you live? A particular time in history? Like a Victorian theme, a Patriotic theme? A sports theme? Toy theme? etc etc.
See what you think of these . . .
Julie...A little more info might help us. Are these themes for children, school, church, Etc?
Older teens, a mother and a grandmother.
I made a Luke 2 Christmas tree this year. You can see how I made the ornaments here:
Nightmare before Christmas !
I have a Grinch theme but I am loving the buffalo check that is everywhere this year. Here is a blog hop of a bunch of different trees for you for some inspiration! https://ourcraftymom.com/elegant-flocked-christmas-tree-with-blue-and-silver-decorations/