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TS Config (root edit and code insert)

TCEFORM.tt_content.header_layout {
    addItems {
        10 = Gray Header
        11 = Orange Header
        12 = Red Header
    }
}


TS Lib oder Setup edit

lib.stdheader.10.10 < lib.stdheader.10.1
lib.stdheader.10.10 {
  dataWrap = >h1 class="gray_header"<|>/h1<
}

lib.stdheader.10.11 < lib.stdheader.10.1
lib.stdheader.10.11 {
  dataWrap = <h1 class="orange_header">|</h1>
}

lib.stdheader.10.12 < lib.stdheader.10.1
lib.stdheader.10.12 {
  dataWrap = <h1 class="red_header">|</h1>
}

Source: http://jainishsenjaliya.wordpress.com/2013/12/19/how-to-add-custom-headers-in-typo3-backend/