.bl {background: url(bl.jpg) 0 100% no-repeat #D5DB91; width: 20em} 
.br {background: url(br.jpg) 100% 100% no-repeat #ECC286} 
.tl {background: url(tl.jpg) 0 0 no-repeat #BCC085} 
.tr {background: url(tr.jpg) 100% 0 no-repeat #ECC286; padding:10px}