Thanks to hzmen1 and his twitter style for showing how to bring back user images.

http://freestyler.ws/style/106095/black-twitter-custom-backgrounds

example code:
body.user-style-Thermalzombie
{
background-image: url("http://www.thermalzombie.com/stylish/blackgreenwave.jpg") !important;
background-position: center 46px !important;
background-attachment: fixed !important;
background-repeat: repeat !important;
}