The 2003-2008 Corolla uses a 5x100 wheel bolt pattern with a 54.1mm hub circle.
You can use pretty much any 5x100 OEM Toyota wheel as an upgrade. Some common examples include:
2003-2008 Matrix XR/XRS 16" Alloy
2003-2008 Matrix XR/XRS 17" Alloy
2003-2008 Corolla LE/S 15" Alloys
2005-2006...