I always use Base notecards for my cards, They are easy to make from a, letter size (8,5x11in) cardstock sheet, which is what I use most of the time. But for all of you that use larger formats or don't want the fuss of making them, here's the file.
I have found the scoring on the explore does not help too much on thick cardstock (over 65 lbs), so I made these to fold easily using little cuts along the folding line.
Import into DS and change the size to 8.5 in wide for the portrait one, and to 5.5 in for the landscape one.
Both files are the same, I just made two so you don't have to rotate the image after importing.
You can also use these to design your cards on other platforms as Illustrator or Corel Draw.