The JQuery Less Template provides a themeroller type interface in a LESS CSS Template. See the ui-lightness example.
@ui-font-family @ui-font-weight @ui-font-size
@ui-sub-font-family @ui-sub-font-weight @ui-sub-font-size
@ui-corner-radius
@ui-header-bg @ui-header-border @ui-header-text @ui-header-icon-color @ui-header-icon-image @ui-header-font-weight
@ui-content-bg @ui-content-border @ui-content-text @ui-content-icon-color @ui-content-icon-image @ui-content-font-weight
@ui-clickable-default-bg @ui-clickable-default-border @ui-clickable-default-text @ui-clickable-default-icon-color @ui-clickable-default-icon-image @ui-clickable-default-font-weight
@ui-clickable-hover-bg @ui-clickable-hover-border @ui-clickable-hover-text @ui-clickable-hover-icon-color @ui-clickable-hover-icon-image @ui-clickable-hover-font-weight
@ui-clickable-active-bg @ui-clickable-active-border @ui-clickable-active-text @ui-clickable-active-icon-color @ui-clickable-active-icon-image @ui-clickable-active-font-weight
@ui-highlight-bg @ui-highlight-border @ui-highlight-text @ui-highlight-icon-color @ui-highlight-icon-image @ui-highlight-font-weight
@ui-error-bg @ui-error-border @ui-error-text @ui-error-icon-color @ui-error-icon-image @ui-error-font-weight
@ui-modal-overlay-bg @ui-modal-overlay-opacity
@ui-drop-shadow-bg @ui-drop-shadow-opacity @ui-drop-shadow-thinkness @ui-drop-shadow-top-offset @ui-drop-shadow-left-offset @ui-drop-shadow-corners