Well, this is a start, but it does not do the breaks in the lines. Maybe someone else can figure that part out.

.
In your User Info Display Templates.
Open getinfo.
Add this anywhere you want. I added it to the bottom of my profile.
PHP Code:
<tr>
<td bgcolor="{*firstaltcolor*}"><normalfont><b>Signature:</b></normalfont></td>
<td bgcolor="{*firstaltcolor*}"><normalfont>$userinfo[signature]</a></normalfont></td>
</tr>
Remove the * in the Alt colors.

.
To put it at the bottom of the profile, add it right below this.
PHP Code:
$referrals
$birthday
$customfields