Well, if you've been following this blog you'll know there has been baby fever, of sorts! It started with the baby onsie favor boxes and now I've done some cards using the same design as the boxes. When cutting I usually select 'Keep Proportions' and select the height for 10.5" File is here
Here are some ideas if you want your card held closed. I've use colored elastic hair bands which may be helpful if you are hold a gift card or gift certificate in place. I used a pink one here...
and a green one running vertically with the stripes.
If you have reversed the paper and have a dark pattern on the inside you could cut a piece of paper(gasp!!) by hand to roughly follow the shape of the card. Also, if the cards were being used as invitations you could also type the info and print it out and shape it the same way.
Extra texture on the tie courtesy of my Cuttlebug.
Another option would be to use some thin magnetic material to hold the front down.