It's possible to use full color icons with a very simple custom mixin.
Code:
/**
* Includes a base64-encoded color icon for use within tab bars and buttons
*
* @include pictos-icon('attachment');
*
* @param {string} $name The name of the icon to be included. This is to match the name of the icon file (located at resources/themes/images/default/pictos) without its extention (.png).
*/
@mixin pictos-icon($name) {
.x-button-icon.#{$name},
.x-button .x-button-icon.x-icon-mask.#{$name} {
background-image: theme_image($theme-name, "pictos/" + $name + ".png");
}
}
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