How to Change desktop background and colors in Win10
Select the Start button, then select Settings > Personalization to choose a picture worthy of gracing your desktop background, and to change the accent color for Start, the taskbar, and other items. The preview window gives you a sneak peek of your changes as you make them.
In Background, select a picture, solid color, or create a slide show of pictures.
In Colors, let Windows pull an accent color from your background, or choose your own color adventure.