Feel free to take any wallpaper you want, that's what they're there for. To set them as your desktop wallpaper, click on the link of the wallpaper you want and wait for it to load. Once it is done, right mouse click on it and save it or just click on set as wallpaper. When you click on the links, some of the images may appear blurry but when you set them as your wallapapers, the quality will be fine. For the best quality, set to stretch, not center or tile.
Wallpaper 1 - Wallpaper I created. It is a wallpaper of Vegeta with a blue background.
Wallpaper 2 - Goku wallpaper with black and yellowish background.
Wallpaper 3 - Wallpaper with Goku, Vegeta and Trunks on blue background.