<md-switch ng-model="status" aria-label="Status" ng-class="{'md-primary': status === true, 'md-warn': status === false}"></md-switch>

/*
 * The bar:
 */

md-switch .md-bar {
    background-color: #333; /* set not selected bar color */
}

md-switch.md-checked .md-bar {
    background-color: pink; /* set selected bar color */
}

md-switch[disabled] .md-bar {
    background-color: rgba(51, 51, 51, .15); /* set disabled bar color */
}

/*
 * The switch:
 */

md-switch .md-thumb {
    color: rgb(158,158,158); /* not selected switch color */
}

md-switch.md-checked .md-thumb {
    background-color: rgb(255,255,255); /* selected switch color */
}

md-switch[disabled] .md-thumb {
    background-color: rgb(255,255,255); /* disabled switch color */
}

/*
 * Ripple effect
 */

md-switch .md-ink-ripple {
   color: rgb(255,0,0); /* not selected switch ripple color */
}
md-switch.md-checked .md-ink-ripple {
   color: rgb(92,184,92); /* selected switch ripple color */
}

md-switch[disabled].my-custom-theme .md-bar {...}