Set how often a box colour will change to
- if random number out of 10 is <=
low number means it will appear less often.

~ ~ Box 1:

Colour

~ ~ Box 2:

Colour

~ ~ Box 3:

Colour

yellow red blue

Set how long it stays before changing,

min time delay
before change
secs
 max time delay
before change (higher)
secs

Change will happen at a randon time between these two numbers.