Powershell Unhide User Information List

$WebUrl = "http://sandyportal2010"
$ListName = "User Information List"
$OpenWeb = Get-SPWeb $WebUrl
$List = $OpenWeb.Lists[$ListName]
$List.Hidden = $false
$List.Update()

The list will then show up in Lists under "View All Content" and in SharePoint Designer "Lists and Libraries" to create workflows on.