Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.3)
// Compass (v1.0.0.alpha.18)
// ----

//Service Group Colours
$srv-grp-01-color:			#542989;
$srv-grp-02-color:			#0079c2;
$srv-grp-03-color:			#50b948;
$srv-grp-04-color:			#a41984;
$colors : $srv-grp-01-color,$srv-grp-02-color,$srv-grp-03-color,$srv-grp-04-color;

@mixin service-group($color) {
	h1, .lead {
		color:$color;
	}

	.block-title,.service-tag {
		background-color:$color;
	}
}

@for $i from 1 through length($colors) {
    $c: nth($colors, $i);
  .srv-grp-0#{$i} {
	  @include service-group(#{$c});
  }
}

SassMeister-output.css

.srv-grp-01 h1, .srv-grp-01 .lead {
  color: #542989;
}
.srv-grp-01 .block-title, .srv-grp-01 .service-tag {
  background-color: #542989;
}

.srv-grp-02 h1, .srv-grp-02 .lead {
  color: #0079c2;
}
.srv-grp-02 .block-title, .srv-grp-02 .service-tag {
  background-color: #0079c2;
}

.srv-grp-03 h1, .srv-grp-03 .lead {
  color: #50b948;
}
.srv-grp-03 .block-title, .srv-grp-03 .service-tag {
  background-color: #50b948;
}

.srv-grp-04 h1, .srv-grp-04 .lead {
  color: #a41984;
}
.srv-grp-04 .block-title, .srv-grp-04 .service-tag {
  background-color: #a41984;
}