drupal-theme-customization-tip-new-color-equals-new-style
For "pixture-reloaded" (and perhaps minelli?) they create a new directory with the specific color scheme and a WHOLE NEW style.css!
This is how you remove the annoying Search this site: text ...
#edit-search-block-form-1-wrapper label{ /* position: absolute; right: 10%;
*/ visibility: hidden;
}