You can customize the look of the main login box in your ts template (plugin.tx_loginboxmacmade_pi1.loginBox.layout). Here's the default layout that is used by the extension:

<tr>

    <td class="tx-loginboxmacmade-pi1-labelCell" width="25%" align="left" valign="middle">

        ###LABEL###

    </td>

    <td class="tx-loginboxmacmade-pi1-fieldCell" width="75%" align="left" valign="top">

        ###FIELD###

    </td>

</tr>

You can use a custom template for the small login box. Here's the default one:

<!-- ###LOGIN### -->

<form action="###FORM_URL###" method="post" enctype="###FORM_ENCTYPE###">

    <input name="###USERNAME###" type="text" size="10">

    <input name="###PASSWORD###" type="password" size="10">

    <input name="submit" type="image" src="###EXT_PATH###res/login.gif">

    ###HIDDEN_FIELDS###

</form>

<!-- ###LOGIN### -->

<!-- ###LOGOUT### -->

<form action="###FORM_URL###" method="post" enctype="###FORM_ENCTYPE###">

    ###USERNAME###

    <input name="submit" type="image" src="###EXT_PATH###res/logout.gif">

    ###HIDDEN_FIELDS###

</form>

<!-- ###LOGOUT### -->