you would have to resize to 4x4 and then add 2 inches of whatever to the side.
I did this awhile back. I scrap 8x10- so I resized the quick page to 8x8 and added a row of pics to the bottom:
http://www.scrapbook-bytes.com/galle...500&ppuser=991
I guess it would depend on the detail of the quick page as to whether or not it would look good in a 4x4 size
hope that helps
editted:
For just paper:
if you wanted to cut out a piece of paper- you could cut out a size 6x4 from the 12x12 with the marquee tool or you could resize the paper down to 6x6 and then crop a 6x4 out of that.
