What do you think about not needing the `-color` suffix when a `light` or `dark` is used? My “personal standard” convention has been to use `-color` as a diambiguator, otherwise relying on the variable name or the suffix. So:

```
$grey:           hsl(0, 0%, 50%);
$grey-light:   hsl(0, 0%, 75%);

$brand-color: #bada55;
$brand-light: lighten($brand-color, 10%);
```