Install your Skin

First of all, you need to download and extract your skin in the web directory. For that, you have two possibilities:

1. Directly put it in the web directory (/web/ckeditor/ for example).
2. Put it in the /Resources/public/ directory of any of your bundles and install the assets.

Register your Skin

Then, to use your skin, just need to register it globally in your configuration:

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# app/config/config.yml
fos_ck_editor:
    default_config: my_config
    configs:
        my_config:
            skin: "skin_name,/bundles/mybundle/skins/skin_name/"

Or you can do it in your widget:

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$builder->add('field', 'ckeditor', array(
    'config' => array('skin' => 'skin_name,/bundles/mybundle/skins/skin_name/'),
));