I did an explosion card for the inside.  I adhered the green snowflake paper to inside of card.  For the explosion section of the card, cut cardstock into a desired sized square.  I did mine 3" X 3".  First, fold the square diagonally (point to point).  Then open the card and fold diagonally the other way.  Open card and you should have an "x" shape from the folds.  Next, fold the card in half once (forms a rectangle).  Open card.  Next, work your card so that it folds together to look like a triangle.  (I know this is hard to explain without step by step pictures.)  While card is fold into triangle shape, fold the outer points inward about 1".  (you will be folding 2 of the points/corners in/over).  Now, open card part way and push the tips in so when the card folds up, the points fold inward.  Then adhere to inside of card.  I stamped a saying with one of my personal rubber stamps to the one side of the card.  I used one of the tree stamps from Fancy Pants "Season's Greetings" clear stamps.  I stamped this image on green cardstock, cut around it, and adhered it to one of the exploding sides of the card.  On the others, I used the alpha stickers that came with the kit and spelled out "joy" and "noel" on each exploding section of the card.