PUBLIC MARKS from decembre with tag picture

Picturefill is a JavaScript file (or a polyfill to be more specific) that enables support for the picture element and associated features in browsers that do not yet support them, so you can start using them today! Picturefill is developed and maintained by Filament Group, with help from the members of the Responsive Images Community Group and the developer community at large.

a search engine which claims to be indexing over a quarter million Creative Commons, Public Domain, GNU FDL, and various other ‘copyleft’ images.

image search with some interesting options; for example, you can choose to search only black and white or color photos.