Ah. Yes I plan on running a little script called color thief (https://github.com/lokesh/color-thief/) I will save the values generated from the script and use it for styling.
Actually, wp.media.gallery exist, but can’t see any attachments to it, hm. wp.media.gallery.attachments exist but only links to a function in media-edtior.js:
* @param {wp.shortcode} shortcode An instance of wp.shortcode().
* @returns {wp.media.model.Attachments} A Backbone.Collection containing
* the media items belonging to a collection.
* The query[ this.tag ] property is a Backbone.Model
* containing the ‘props’ for the collection.
