Random background color from specified color array, plus ability to coordinate site elements to match. Based on code from the following: http://www.thecodepress.info/2013/05/change-background-color-on-every.html#.UbHqwpwYh3B http://lab.clearpixel.com.au/2008/06/darken-or-lighten-colours-dynamically-using-php/

Background color from array

      <?php
  		$colors = Array("#028cd5", "#b6cd3f", "#fa6128", "#fdb93c", "#ab4785");
         $color_change = "";
			$change = rand(1, 5);
			switch($change){
				case 1: $color_change = $colors[0];
				break;
				case 2: $color_change = $colors[1];
				break;
				case 3: $color_change = $colors[2];
				break;
				case 4: $color_change = $colors[3];
				break;
				case 5: $color_change = $colors[4];
				break;
				default: echo "Something going wrong!";
			}
         function colorBrightness($hex, $percent) {
            $hex = str_replace('#','',$hex);
            /// HEX TO RGB
            $rgb = array(hexdec(substr($hex,0,2)), hexdec(substr($hex,2,2)), hexdec(substr($hex,4,2)));
            //// CALCULATE
            for ($i=0; $i<3; $i++) {
               // See if brighter or darker
               if ($percent > 0) {
                  // Lighter
                  $rgb[$i] = round($rgb[$i] * $percent) + round(255 * (1-$percent));
               } else {
                  // Darker
                  $positivePercent = $percent - ($percent*2);
                  $rgb[$i] = round($rgb[$i] * $positivePercent) + round(0 * (1-$positivePercent));
               }
               // In case rounding up causes us to go to 256
               if ($rgb[$i] > 255) {
                  $rgb[$i] = 255;
               }
            }
            //// RBG to Hex
            $hex = '';
            for($i=0; $i < 3; $i++) {
               // Convert the decimal digit to hex
               $hexDigit = dechex($rgb[$i]);
               // Add a leading zero if necessary
               if(strlen($hexDigit) == 1) {
               $hexDigit = "0" . $hexDigit;
               }
               // Append to the hex string
               $hex .= $hexDigit;
            }
            return '#'.$hex;
         }
         $brightness = 0.4; // lighter (add minus to make darker)
         $color_lighten = colorBrightness($color_change,$brightness);
		?>
		<style>
			body { background-color:<?php echo $color_change; ?>; }
         h1, a:hover, a:active  { color:<?php echo $color_lighten; ?>; }
		</style>