First set 4 columns for the blog view. Then, create a thumbnail image together with a short description. All this goes before the 'readmore' tag and will be displayed in the blog view. After the 'readmore tag' you should insert a full sized image and all the info you'd want to have for the item.

Then, change the "Show Intro Text" option to "No" in Global Configuration which is on the Article Manager page.

You would also need to adjust your template to get the desired display, of course, but nonetheless, it is quite cool that you can bake those product galleries so easily using standard Joomla! only.