A very alpha attempt at searching the DPLA by color, a subset of it anyway. Currently around 500K thumbnails have been indexed by color, but more are being added when I find time.
The palette is limited to colors in the CSS3 Palette, very much inspired by the work of the Cooper Hewitt.
Some very naive color clustering has also been employed to help find colors similar to the css3 palette. This might have been a bad idea which will not make it to beta. Sometimes you learn the hard way.
The code, very much in need of clean up, is available on Github
Built by Chad Nelson, with tons of help from open source developers everywhere.