Visual affordance in checkbox controls
Unchecked & Enabled
Unchecked & Disabled
'Lock' icon version. Nice but may get confused with 'secure'.
Checked & Disabled
Alternative 'ban/not-allowed' styled version - more in keeping with not-allowed cursor
SPECIAL
With label-like 'off' and 'on' indicators, populated in this case using ::before/::after content
Go forth, code Ninja, and play…