how can i design a christmas tree?

Answer 1

Not sure what you are asking here.
The tree itself is already pretty well designed.
If you mean the ornaments and lights, there are as many ways to decorate it as there are people.
I have multiple trees. One is suns, moons , stars, dragons, wizards, antique ornaments, another is white snowflakes and icicles,, another toys and kid things.
You can do fun & crazy, or classic and elegant, or use only natural things like pinecones and berries, or use only homemade stuff...
The possibilities are endless!