Black and White hover

img {
    filter: url(http://static.tumblr.com/eptm5us/ueTmafr4p/filters.svg#grayscale);
    filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale");

    filter: gray; /* IE6-9 */
    -webkit-filter: grayscale(100%);
    -webkit-transition: all .6s ease;
    -webkit-backface-visibility: hidden;}

img:hover {
    filter: none;
    -webkit-filter: grayscale(0%);}