It is possible for you to change your ClassLink Wallpaper and color palette. Follow the directions bellow.
1. Click on your profile pic in the top right and select "Settings".
2. From the Settings page, select the "Themes" tab.
3. Click on "Palette" or "Custom Wallpaper" to change your selection.
4. Under "Wallpaper" you have 3 options.
Default - Set of ClassLink provided Wallpaper options.
Custom - Set of District provided Wallpaper options.
Color - Set the wallpaper to a color of your choice.