Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.4)
// Compass (v1.0.1)
// ----

$subicons: (
	av-ico-logomarca: (
		top: 0,
		left: 0,
		topHover: -74px,
		leftHover: 0,
		imgBack: '../images/icons/av-design.png'
	),
	av-ico-print: (
		top: 0,
		left: -179px,
		topHover: -74px,
		leftHover: -179px,
		imgBack: '../images/icons/av-design.png'
	),
	av-ico-embalagem: (
		top: 0,
		left: -374px,
		topHover: -74px,
		leftHover: -374px,
		imgBack: '../images/icons/av-design.png'
	),
	av-ico-material: (
		top: 0,
		left: -554px,
		topHover: -74px,
		leftHover: -554px,
		imgBack: '../images/icons/av-design.png'
	),
);

//
// A ideia é usar as KEYS que já estão no maplist acima no lugar desses logo abaixo
//
.av-ico-logomarca:before,
.av-ico-print:before,
.av-ico-embalagem:before,
.av-ico-material:before {
	content: "";
	display: block;
	margin: 0 auto 20px;
	width: 70px;
	height: 70px;
	background-repeat: no-repeat;
	background-position: 0 0;
}


@each $subicon, $positions in $subicons {
	$top: map-get($positions, top);
	$left: map-get($positions, left);
	$topHover: map-get($positions, topHover);
	$leftHover: map-get($positions, leftHover);
	$imgBack: map-get($positions, imgBack);

	.#{$subicon} {
		&:before {
			background-image: $imgBack;
			background-position: $left $top;
		}

		&:hover:before {
			background-position: $leftHover $topHover;
		}
	}
}

SassMeister-output.css

.av-ico-logomarca:before,
.av-ico-print:before,
.av-ico-embalagem:before,
.av-ico-material:before {
  content: "";
  display: block;
  margin: 0 auto 20px;
  width: 70px;
  height: 70px;
  background-repeat: no-repeat;
  background-position: 0 0;
}

.av-ico-logomarca:before {
  background-image: "../images/icons/av-design.png";
  background-position: 0 0;
}
.av-ico-logomarca:hover:before {
  background-position: 0 -74px;
}

.av-ico-print:before {
  background-image: "../images/icons/av-design.png";
  background-position: -179px 0;
}
.av-ico-print:hover:before {
  background-position: -179px -74px;
}

.av-ico-embalagem:before {
  background-image: "../images/icons/av-design.png";
  background-position: -374px 0;
}
.av-ico-embalagem:hover:before {
  background-position: -374px -74px;
}

.av-ico-material:before {
  background-image: "../images/icons/av-design.png";
  background-position: -554px 0;
}
.av-ico-material:hover:before {
  background-position: -554px -74px;
}

Resolvi aqui do jeito mais burro e possivelmente mais sujo possível. Mas funcionou lindamente. Mesmo assim, vou usar essa solução que é bem mais inteligente.

$hoverPos: -74px
$beforeIcon: "&:before"
$beforeIconHover: "&:hover:before"

$classesIcons:  ".av-ico-logomarca:before, .av-ico-print:before, .av-ico-embalagem:before, .av-ico-material:before"

@mixin iconPos($left, $top)

    #{$beforeIcon}
        @content
        background-position: $left $top

    #{$beforeIconHover}
        @content
        background-position: $left $hoverPos

////
// Design Icons
////
.av-ico-logomarca:before,
.av-ico-print:before,
.av-ico-embalagem:before,
.av-ico-material:before
    background-image: url(../images/icons/av-design.png)

.av-ico-logomarca
    @include iconPos(0, 0)

.av-ico-print
    @include iconPos(-179px, 0)

.av-ico-embalagem
    @include iconPos(-374px, 0)

.av-ico-material
    @include iconPos(-554px, 0)




@mixin commonConfigIcons
    #{$classesIcons}
        @content
        content: ""
        display: block
        margin: 0 auto 20px
        width: 70px
        height: 70px
        background-repeat: no-repeat

@include commonConfigIcons

Esse é o final. Vou resolver depois o esquema com o background-image.

$topHover: -74px;

$subicons: (
    av-ico-logomarca: (
        left: 0,
        imgBack: '../images/icons/av-design.png'
    ),
    av-ico-print: (
        left: -179px,
        imgBack: '../images/icons/av-design.png'
    ),
    av-ico-embalagem: (
        left: -374px,
        imgBack: '../images/icons/av-design.png'
    ),
    av-ico-material: (
        left: -554px,
        imgBack: '../images/icons/av-design.png'
    ),
);


@each $subicon, $positions in $subicons {
    $left: map-get($positions, left);
    $imgBack: map-get($positions, imgBack);

    .#{$subicon} {
        &:before {
            background-image: url($imgBack);
            background-position: $left 0;
        }

        &:hover:before {
            background-position: $left $topHover;
        }
    }
}


//
// Common Icon Styles
//

$subicons-keys: map-keys($subicons);
$class-selector: ();

@each $key in $subicons-keys {
    $class-selector: append(
        $class-selector,
        unquote(".#{$key}:before"),
        comma
    );
}

#{$class-selector} {
    content: "";
    display: block;
    margin: 0 auto 20px;
    width: 70px;
    height: 70px;
    background-repeat: no-repeat;
    background-position: 0 0;
}