Theme Grid Layout of Views Modules

I'm trying to adjust the theme of a grid view using the overriding template files. However I've run into a spot of bother with the $item variable. I basically want to split this apart or at least be able to reference additional fields from the node and not just the teaser.
Could anyone shine a light on this for me?

foreach ($rows as $row_number => $columns): 
	foreach ($columns as $column_number => $item):
             print $item;
	endforeach;
endforeach;