This CSS snippet will make the tables on your forum partially transparent, allowing it to blend more easily into your background.

Preview

<style type="text/css">
<!--
table {
filter: alpha(opacity=70);
opacity: 0.7;
-moz-opacity: 0.7;
}
//-->
</style>

Simply edit the blue. For the first line, enter the transparency as a percentage [70 = 70% opaque, 100 = 100% opaque]. For the next two, enter the transparency as a decimal [0.7 = 70% opaque, 1.0 = 100% opaque].

Global headers.