Youtube video gallery

Demo:http://flipit.im/showcases

modules used:
colorbox
Video Embed Field

Installation:
------------
1. Download and unpack the Libraries module directory in your modules folder
(this will usually be "sites/all/modules/").
Link: http://drupal.org/project/libraries
2. Download and unpack the Colorbox module directory in your modules folder
(this will usually be "sites/all/modules/").
3. Download and unpack the Colorbox plugin in "sites/all/libraries".
Make sure the path to the plugin file becomes:
"sites/all/libraries/colorbox/jquery.colorbox-min.js"
Link: https://github.com/jackmoore/colorbox/archive/1.x.zip
Drush users can use the command "drush colorbox-plugin".
4. Go to "Administer" -> "Modules" and enable the Colorbox module.


Make a view of your content type

and in manage fields of your content type select thumbnail preveiw with colorbox

When adding videos just enter youtube video url on Video Embed Field like https://www.youtube.com/watch?v=2DfmD6R-dt0

Great Module to display Your newely added image filed of any other field horizontally.

Demo:http://paragonllcapps.com/?q=node/7

Grid Field Formatter

https://drupal.org/project/grid_field_formatter

Depends on


Field formatter settings

https://drupal.org/project/field_formatter_settings


Add these modules 

Go to admin/config/content/grid-field-formatter

enable fields for whom you want these option to be available.

Go to

Home » Administration » Structure » Content types » Apps >> Manage Display Click on configure icon on right side of field and then select the checkbox

Enable multi-value field display with a grid layout.
Enter Number of columns you want to have and you are done.