To make this card I cut a 12 x 12 piece of cardstock in three to make three strips of 4 x 12 (this gives you three cards), and scored at 4", 6" and 8".
Fold along score lines as above.
And decorate! You can use anything to hold the card upright. Today I've used a button :)
This card can be made larger simply by cutting a seperate piece of cardstock the size of the base and adhering it.