As long as the New Users are contained in a list (with a proper class attached to it), you can rearrange the users into a multi-column list yourself by restyling that list:

ul.newusers {
  width: 90%;
  position: relative;
}

ul.newusers li {
  width: 30%;
  display: inline;
}
[download]

Adjust the precentage to suit your desired number of columns :-)