I've printed on some 12 x 12 papers using my regular printer.
I've cut 3 or 4 inches off and then used the Landscape (I think that's what it's called) and it will print farther on the 12 x 12. Then I piece the 3 or 4 inches I cut off and place a strip of decorative paper to cover the 2 matching areas.
Also, I've used my American Greetings CD and used the "Banner" mode and it makes it print longer than the average 8 1/2 x 11.
Good Luck!
Deb