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You can download the pattern or use the CSS3 code below (you can copy the text).
body{
/* CSS3 pattern provided by JonesPatterns.com */
background-image:
-moz-linear-gradient(-120deg, #f90 30px, transparent 30px),
-moz-linear-gradient(-60deg, #f90 30px, transparent 30px),
-moz-linear-gradient(-120deg, #fc0 60px, transparent 60px),
-moz-linear-gradient(-60deg, #fc0 60px, transparent 60px),
-moz-linear-gradient(-120deg, #f90 70px, transparent 70px),
-moz-linear-gradient(-60deg, #f90 70px, transparent 70px),
-moz-linear-gradient(-120deg, #ff0 80px, transparent 80px),
-moz-linear-gradient(-60deg, #ff0 80px, #f90 80px);
background-image:
-o-linear-gradient(-120deg, #f90 30px, transparent 30px),
-o-linear-gradient(-60deg, #f90 30px, transparent 30px),
-o-linear-gradient(-120deg, #fc0 60px, transparent 60px),
-o-linear-gradient(-60deg, #fc0 60px, transparent 60px),
-o-linear-gradient(-120deg, #f90 70px, transparent 70px),
-o-linear-gradient(-60deg, #f90 70px, transparent 70px),
-o-linear-gradient(-120deg, #ff0 80px, transparent 80px),
-o-linear-gradient(-60deg, #ff0 80px, #f90 80px);
background-image:
-webkit-linear-gradient(-120deg, #f90 30px, transparent 30px),
-webkit-linear-gradient(-60deg, #f90 30px, transparent 30px),
-webkit-linear-gradient(-120deg, #fc0 60px, transparent 60px),
-webkit-linear-gradient(-60deg, #fc0 60px, transparent 60px),
-webkit-linear-gradient(-120deg, #f90 70px, transparent 70px),
-webkit-linear-gradient(-60deg, #f90 70px, transparent 70px),
-webkit-linear-gradient(-120deg, #ff0 80px, transparent 80px),
-webkit-linear-gradient(-60deg, #ff0 80px, #f90 80px);
background-image:
linear-gradient(210deg, #f90 30px, transparent 30px),
linear-gradient(150deg, #f90 30px, transparent 30px),
linear-gradient(210deg, #fc0 60px, transparent 60px),
linear-gradient(150deg, #fc0 60px, transparent 60px),
linear-gradient(210deg, #f90 70px, transparent 70px),
linear-gradient(150deg, #f90 70px, transparent 70px),
linear-gradient(210deg, #ff0 80px, transparent 80px),
linear-gradient(150deg, #ff0 80px, #f90 80px);
background-size: 80px 100px;
}