I love simple plugins that do the job. This is one of those.
I modified the CSS to match my Dreamline theme, which is is pretty dark. You can see how it turned out at http://www.iceflatline.com. Here's the modified CSS in case someone is running Dreamline or would like a darker contact form. Thanks again for this plugin. It's exactly what I was looking for.
.clean-contact { text-align: left; width: 30em; display: block; border:0; padding-top: 1em; }
.clean-contact input[type=text] {background-color: #1A1A1A; border:solid 1px #37363C; color: #CCCCCC; width: 100%; margin-bottom: .5em;}
.clean-contact label { clear: none; display: inline; text-align: left; }
.clean-contact textarea{background-color: #1A1A1A; border:solid 1px #37363C; color: #CCCCCC; width: 100%; height: 15em; margin-bottom: .5em; font-size: 1.2em; }
.clean-contact label em { font-weight: bold; font-style: normal; color: red; }
.clean-contact-msg { font-weight: bold; padding: .5em; -moz-border-radius: 5px; -webkit-border-radius: 5px; margin-bottom: .5em;}
.clean-contact-msg.ok{ background-color: #1A1A1A; border:solid 1px #37363C; }
.clean-contact-msg.err{ background-color: #1A1A1A; border:solid 1px #006699; display:none; }