Simply put, CSSgram is a library for editing your images with Instagram-like filters directly in CSS. What we’re doing here is adding filters to the images as well as applying color and/or gradient overlays via various blending techniques to mimic these effects. This means less manual image processing and more fun filter effects on the web!
They are using pseudo-elements (i.e. :after) to create the filter effects, so you must apply these filters on a containing element (i.e. not a content-block like <img alt=”” />). The recommendation is to wrap your images in a <figure> tag.
Requirements: CSS
Demo: http://una.im/CSSgram/
License: MIT License
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Source: Web Appers