Popup Card by Nicole Verkooijen
The instructions to make this card, including the dimensions for the original sized card (10.5x15cm) can be viewed on Youtube. Nicole is Dutch but the dimensions are printed on the card and the way she shows you the construction is really easy to follow even if, like me, you don’t speak a word of Dutch.
To make a 6x6" version of this card you need two sheets of 12x12" cardstock, cut your base at 6" from one. Cut the remainder down to 5" and score at 3", 6" and 9" (this is the inside "popup" four panels for the card). Cut the second piece of cardstock down to 10" and then cut out and score as per the picture below.