Type /colour background 3
The background should change to green.
Type /colour background 0
Now it should change back to plain white.
Colour numbers are
0 White
1 Black
2 Navy Blue
3 Green
4 Red
5 Brown
6 Purple
7 Orange
8 Yellow
9 Light Green
10 Cyan
11 Light Blue
12 Dark Blue
13 Fuchsia (Pink)
14 Dark Grey
15 Light Grey
The /colour command will work as "/colour" the correct spelling or "/color" the incorrect spelling, just depends on where you are and what you are used to.
