I like the 12 X 12 square pages too, so I've been uploading my pages to ezpints.com. They offer 12 X 12 glossy, matte, or lustre finish and they look awesome! Each page is about $4.70, so it gets pricey if you have a lot of pages to print. I've tried taking them to Kinko's to print but I wasn't happy with the quality.

After I get them back I just put them right into a 12 X 12 album.