X-Plane 10 Realistic Sky Colors. This is a replacement sky color set for X-Plane 10. Before using this file, backup your existing color set in case you wish to revert back to the originals. To install: Unzip the downloaded file, then copy the files contained within the 'Realistic Skycolors X-Plane 10' folder to - X-Plane - Resources - bitmaps - skycolor. Hope you enjoy these new colors! By Abdullah Almuntassir.