Hi there! Last year I made this same Christmas wallpaper for your devices and today I thought I’d revamp it a little and add some new sizes for you!
If you’re not sure how to get it, click on the size, hold and save to your camera roll, or right-click and save to computer. Then go to settings or personalisation, find background and select the size you just saved. With the iPhones and iPads you shouldn’t need to resize them and with the desktop one (if you don’t know your computer screen size), it might just be a bit of trial and error. To save them from your iPad/iPhone make sure you are viewing the images in Safari and hold your finger on the photo and it will then ask if you want to save it to camera roll. Then go in to your settings and choose the wallpaper option.
PS. Here are some previous wallpapers – you may like those too!