I've never seen Xmasland on any maps, but if this theme is anything to go by, it must be an incredible place.
The Xmasland theme adds an enticing winter scene as a background wallpaper. The scene includes snow-covered houses and a quaint little bridge leading up to the church. It's a charming festive interpretation and has been wonderfully illustrated.
The Xmasland theme also tweaks the color scheme of your S60 5th Edition interface, adding silvers and blues to match the main image. Unfortunately, it doesn't add any new Christmas icons though.
If you want to feel instantly Christmassy then I can recommend installing the Xmasland Theme.