Attached is a larger card I made for my DD that has a layout using a photo (she's a photographer and took the self portrait). Although I didn't use stamps, the layout could easily be done using background stamps for the paper and decorative stamps instead of the epoxy stickers. I'm pretty sure I used a full sheet of CS folded in half but there's a chance it could be 5x7. Sorry I can't remember. Guess I should start making notes of the sizes of my cards.
For more large cards, here's a link to my gallery:
stampintoo's Gallery at Splitcoaststampers
The Copper Butterfly cards show the difference between a full sheet of CS folded in half and a 5x7. (These were when I first started stamping and I hate the fiber and the strips of paper on the bottom - I use ribbon now.)
Beauty and the Butterfly is a half-fold size, too, either that or 5x7.
5x7s - Bud Basics Shabby Velvet and I think Cute & Screwy Birthday Truck is too. (I really am going to start including sizes, sheesh!)
HTH. Enjoy making your special Christmas cards.
April