Well, I was unsure if we choose a FS9 specific original livery, or an actual livery.
Anyways, my favorite is the Special Malaysia Hibiscus theme:

It's the Project Opensky 747-400 in the Malaysia Hibiscus livery.
Excuse me, but it's 30.5 KB on my computer, and I have absolutely no clue how to drop it lower and keep it legible.