It's possible to change activities and conditionnal items color with :
- a "#ColorCode" before the activity.
- a "#ColorCode:" before the "if".
But there is no way to set a note color:

@startuml
start
#green:if (Turn On The Game?) then (yes)
:Having Fun;
else (no)
#red:Not Having Fun;
note right:sad note is sad
endif
stop
@enduml
Please provide a way to inline set the background color of notes.
Example syntax: note right #blue :sad note is sad