See all the chessboards created using only CSS, presented at the CSS Challenge during the first parallel activity at WWW2013.
Leonardo Lima
http://cdpn.io/xjAga
Richard Duchatsch Johansen
http://ridjohansen.site44.com/css_challenge/
Thiago Dini
http://thiagodini.com/experimentos/chess-table-css.html
Vanessa Me Tonini
http://www.vanessametonini.com.br/chess/