From Sugar Labs

1. open the control panel

2. open the About Me panel

3. click on the XOs to see if the colors change and the alert message appears

The icons to the left of the central XO are used to modify the fill color; the icons to the right are used to modify the stroke color.

4. exit and see if the selected colors appear on reboot

Initial colors with options for changing fill (left) and stroke (right)

After clicking on the left-most icon, the fill color has changed; the icon second from the left can be used to undo the change

After clicking on the right-most icon, the stroke color has changed; the icon second from the right can be used to undo the change