Hello
By default this option is not available. You could try copying the source from your example site which looks some like the following...
HTML (add to custom module)
<div class="service-icon"> 
	<i class="fa fa-flash fa-3x"></i>
	<i class="fa fa-flash fa-3x"></i>
</div>
CSS (add to template Custom CSS field)
.service-icon {
    display: inline-block;
    height: 85px;
    width: 85px;
    line-height: 101px;
    -webkit-transform: rotate(47deg);
    -moz-transform: rotate(47deg);
    -ms-transform: rotate(47deg);
    -o-transform: rotate(47deg);
    transform: rotate(47deg);
}
.service-icon i {
    -webkit-transform: rotate(-48deg);
    -moz-transform: rotate(-48deg);
    -ms-transform: rotate(-48deg);
    -o-transform: rotate(-48deg);
    transform: rotate(-48deg);
}
Ciaran