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The plugin creates a nicely animated gallery out of attachments to a post. A demo is available at just-in-case.tv. All pictures are shown on a kind of image wall. Once one clicks on one of them, it opens in a kind of lightbox (fullscreen). Using the arrows on the right and left side, it is possible to display the next or previous picture. Previews of next and previous picture are available. 
Since version 0.5, the plugin features individual facebook LIKE buttons for each picture in the gallery.
Technically, it uses JQuery and needs Javascript to work.
A demo installation is available at <a href="http://just-in-case.tv" title="Embrace your grace ... and use the case! - Just in Case..." rel="nofollow ugc">just-in-case.tv</a>.
To use it, just install the plugin, attach some images to a post and insert [just_in_case_gallery] into the post. It works best with the theme Twenty Twelve.
Have fun!

Just In Case Gallery

The plugin creates an image wall including a nicely animated gallery out of attachments to a post.

MB Creation

Popup a message on your WordPress blog is now very easy.
If you want to promote your brand new newsletter functionnality, display advertising on your homepage or get more Facebook fans you can use Simple Popup Manager to popup a message all over your content in a lovely “lightbox effect”. You can customize your message using a WP editor and of course specify the width and the height of the message box. You can limit the display of the message on either session or days basis.
<ul>
<li>Choose wether the popup will be displayed only on homepage or on every page</li>
<li>Set size, width and threshold of the popup (you can disable mobile)</li>
<li>Customize background-color and opacity</li>
<li>Popup content is just a normal WordPress editor (you can use shortcode)</li>
</ul>

Simple Popup Manager

Simple Popup Manager allows you to easily popup and display a simple message box on your WordPress front page.

Just In Case Gallery vs Simple Popup Manager