Makes colours more distinct from each other. Combinations such as
adjacent placement of:
+ Subtle and intense cyan.
+ Subtle and intense blue.
+ The cyans with the blues.
+ Cyans with greens.
The intense red bg was also refined to look more harmonious with the
blue/green side of the spectrum.
These refinements are fairly small in their own right. Their value
can only be appreciated in the context of the entire theme.