Justified Image Grid will display your single pictures from NextGEN - most likely you need that for the lightbox or caption options and for uniformity's sake. Flow a single picture to the left or right of paragraphs easily - right-to-left reading direction is also supported. The plugin gives you control over spacing and margin for a perfect alignment with your text. Your previously-added NextGEN single picture shortcodes can be hijacked too if you prefer. In case you add multiple NextGEN image IDs then their order will be respected in the resulting gallery. Use it when you need to explicitly tell the plugin what to show. It's great for a handful of photos that are better as part of the content than in standalone galleries.