Hi there! You are currently browsing as a guest. Why not create an account? Then you get less ads, can thank creators, post feedback, keep a list of your favourites, and more!
Couldn't find a tutorial, but according to CuriousB here it's pretty much like making other objects, but with a few differences outlined in their post.
Criquette has one on how to light up the deco (for buildings, etc.), here.
This site is not endorsed by or affiliated with Electronic Arts, or its licensors. Trademarks are the property of their respective owners. Game content and materials copyright Electronic Arts Inc. and its licensors. All Rights Reserved.