<input type="text" placeholder="Primeiro e Último nome apenas" value="John Doe">
<!--               └────────────────────┬────────────────────┘ └──────┬───────┘
                                   color: #ccc                   color: #444
-->

::-webkit-input-placeholder {
   color: red;
}

:-moz-placeholder { /* Firefox 18- */
   color: red;
}

::-moz-placeholder {  /* Firefox 19+ */
   color: red;
}

:-ms-input-placeholder {
   color: red;
}

input,
textarea {
    padding: 10px;
    display: block;
    width: 70%;
}

::-webkit-input-placeholder {
   color: orange;
   font: 12px verdana, arial, sans-serif;
}

:-moz-placeholder {
   color: orange;
   font: 12px verdana, arial, sans-serif;
}

::-moz-placeholder {
   color: orange;
   font: 12px verdana, arial, sans-serif;
}

:-ms-input-placeholder {
   color: orange;
   font: 12px verdana, arial, sans-serif;
}