Create CSS-Only placeholder images. I'm using the term "FPO" (For Placement Only) because "placeholder" is already a keyword in Sass and things would get confusing fast.

http://sassmeister.com/gist/14af5a6c73d723ad4715

Via Bower:

bower install sass-fpo --save-dev

Or NPM:

npm install sass-fpo --save-dev

Make sure you add the installation directory (bower_components or node_modules by default, respectively) to your included paths in your sass config.

Import sass-fpo into your stylesheet:

@import "sass-fpo/sass/fpo.scss";

Type: Boolean

If true, warns you at compile time that FPO elements are being used in the project. Defaults to true.

Creates the FPO image. Takes one Map argument, that has four optional properties:

Type: Number (Unitless) [1]

The size of the height, in relation to the width. For example, 1 will set the height equal to the width and 0.5 will set the height to 50% or the width.

Type: Color [random]

The background color of the FPO image.

Type: List ['bold 20px/1 sans-serif']

The font property to use on the FPO text.

String ['FPO']

The text to display in the FPO image.

This plug-in requires Ruby Sass >= 3.4 or LibSass >= 3.1.