jquery-mosaic
See documentation and working examples here http://jquery-mosaic.tin.cat
A jQuery plugin by Tin.cat that builds responsive mosaics of images or any other content fitted to match heights in multiple rows while maintaining aspect ratios.
Works wonderfully with images by creating a visually ordered and pleasant mosaic (much like mosaics on Flickr, 500px and Google+) without gaps between elements, but at the same time respecting aspect ratios. Reacts to window resizes and adapts responsively to any screen size.
Here's a bonus (NSFW) working site using jQuery mosaic: https://skinography.net
License
jQuery Mosaic is released under the MIT License, meaning you can do with it whatever you want, even for commercial and obscure purposes. A credit somewhere would be appreciated, though!
Please
Please don't use jQuery Mosaic to show photos of animal abuse. Seriously.