<table class="tableWithBackground" width="200px" height="200px" border="1">
    <tr>
        <td>
            <img class="tableBackground" src="http://goo.gl/AKPWq">
            Hello
        </td>
        <td>
            World
        </td>
    </tr>
    <tr>
        <td>How are<br><br><br><br><br>you?</td>
        <td>I am fine</td>
    </tr>
</td>

.tableWithBackground { position: relative; }
.tableBackground {
    position: absolute;
    z-index: -1;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
}