Template:Rainbow Header

<h2 style="border-bottom: Orange 2px solid; text-align: center; border-left: Orange 2px solid; padding-bottom: 0.2em; margin: 0px 0px 10px; padding-left: 0.4em; padding-right: 0.4em; background: -moz-linear-gradient(left, red, orange, yellow, green, blue, indigo, violet); background: -o-linear-gradient(left, red, orange, yellow, green, blue, indigo, violet); background-color:black; background: -webkit-linear-gradient(left, red, orange, yellow, green, blue, indigo, violet); color: white; font-size: 150%; border-top: Gold 3px solid; font-weight: bold; border-right: Gold 3px solid; padding-top: 0.2em; -moz-border-radius: 3px; border-radius: 3px;">

Documentation
"title" being what you want it to say.