Greg - SiteOrigin

The SiteOrigin Masonry plugin gives you a widget that you can use to display your posts. It gives you a widget you can add to your <a href="https://wordpress.org/plugins/siteorigin-panels/" rel="ugc">Page Builder</a> pages or sidebar.
Take a look at the demo <a href="http://demo.siteorigin.com/origami/masonry-layout/" rel="nofollow ugc">here</a>.
<a href="http://eepurl.com/hbvhM" rel="nofollow ugc">Our newsletter</a> is a great place to stay up to date with Masonry Widget and the rest of our free WordPress products.

Masonry Widget

The SiteOrigin Masonry plugin gives you a widget that you can use to display your posts. It gives you a widget you can add to your Page Builder pages  …

Aaron D. Campbell

A widget that displays rotating images from a post’s gallery in the sidebar of 
your site. You just specify the post or page, and it will cycle through all the 
images from the gallery of that post or page. you can have as many of them as 
you want on your site simultaneously. Requires PHP5.
In WordPress 2.6, another plugin of mine has been included into the CORE to 
allow these to be reorder your images to make them display in whatever order you 
prefer. Until then, go get <a href="https://wordpress.org/extend/plugins/reorder-gallery/" rel="ugc">Reorder Gallery</a>!

Gallery Widget Pro

A widget that displays rotating images from a post's gallery in the sidebar of your site. Requires PHP5.

Masonry Widget vs Gallery Widget Pro