SiteOrigin’s Masonry Widget for specific posts only in my wordpress

Want to use the feature as – which will look exactly like : http://demo.siteorigin.com/origami/masonry-layout/ .

but not for all the posts I have..

I need it only for specific ( like 5 posts only out of all posts i have in my site) number of posts only.
How do I do this?

and also can I use it for pages too other than posts? If yes, How to?