buzztone on "[Plugin: Contact Form 7] Contact form 7: Would like to customize two different forms.."

Each CF7 form has a unique ID like wpcf7-f8-p275-o2. Use Firebug or Chrome Dev Tools to find the ID of each form and then target your CSS changes to each individual form e.g.

#wpcf7-f8-p275-o2 .wpcf7-form {
    background:#dcc8a5;
    padding:20px;
    border:2px solid #f6efdf;
    margin-bottom:30px;
}