View with Colorbox triggered galleries
This how you can create a Views gallery that consists of images that each trigger a Colorbox gallery (with grouped images).
This can be done with a pure views approach.
Install the Image URL Formatter module and create a basic view (filtered by the desired content type) with the following fields:

Content: Nid
Content: Images (your field with images)
Content: Images (the same field, again)

Configure the fields as follows:

Content: Nid

Check &quot;Exclude from display&quot;

Content: Images (the first field, which will be the visible cover image)

Formatter: Image URL
URL type: Absolute file path
Multiple field settings: display &quot;1&quot; value(s)
Rewrite results: &lt;a href=&quot;[field_images]&quot; class=&quot;colorbox&quot; rel=&quot;gallery-[nid]&quot;&gt;&lt;img src=&quot;[field_images]&quot; /&gt;&lt;/a&gt;

Content: Images (the second field, which consists of links to the other images)

Formatter: Image URL
URL type: Absolute file path
Multiple field settings: display &quot;all&quot; value(s) starting from &quot;1&quot;
Rewrite results: &lt;a href=&quot;[field_images_1]&quot; class=&quot;colorbox&quot; rel=&quot;event-[nid]&quot;&gt;&lt;/a&gt;


I'm sharing this because I couldn't find any reference myself (this approach didn't do it for me).