Justified Image Grid allows you to create a gallery based on a predefined Flickr search. Various factors are available to narrow your results and ensure that the content is relevant. A useful choice is to only search among your photos. By using PHP template tags one could connect to the WordPress search results to let visitors perform Flickr searches in their online portfolio. Match individual pictures... or photos by tag - from your Photosteam or through a global Flickr search. It's a fun and quick way to populate galleries.
Photos from Blizzcon, global search
This gallery looks for photos taken at Blizzcon, but only those that are allowed to be shown by their licensing. They are sorted by relevance.
Photos tagged with "Lake" from a Flickr user's portfolio
You can't go wrong with this one, since you manage your own portfolio and all the results will be just what you expect. Flickr allows tagging your photos and this is where you can take advantage of that. See the same thing on Flickr: Lake by Pircho.