Instructions:

- Select the wallpaper that suits your screen size - click here to check your resolution
- When the wallpaper displays, right click and select 'Save as Wallpaper' or 'Set as Background'. 

800 x 600
1280 x 800
1280 x 1024
1600 x 1200
1920 x 1080

Instructions:

1. Open this page in Safari on your iPhone
2. Push down on any of the images below with your finger and choose the 'save image' tab.
3. Return to the phone's main menu and click on the 'photos' button.
4. Choose the 'camera roll' option and find the wallpaper
5. Tap button and choose 'use as wallpaper'

iPhone 4

iPhone 5

Instructions:

1. Open this page in Safari on your iPad
2. Click on the link below to maximise
3. Push down with your finger and choose the 'save image' tab.
3. Return to the iPad's main menu and click on the 'photos' button.
4. Choose the 'camera roll' option and find the wallpaper
5. Tap button and choose 'use as wallpaper'

Link