(First two pictures taken from Laine's Diary)
Zutter also produces chipboard covers and inner pages in a variety of sizes 8x8, 6x6, 4x4 and 5x7. Each pack of chipboard cover comes with 20 inner pages that come in cream, black or white colours.
You could also use the Zutter for lots of other stuff like punching holes in a shoe box to make ribbon storage. Check out Laine's post for more info.