The first of the cards we did in my class was this balloon card.
And this is the inside of the card. I have seen this technique a couple times. There are several You Tube videos on this cards.
Glue the peaks like this.
There is an idea using this technique with ghosts on one of the videos. I think it would be fun with spiders for Halloween. Flowers would be cute too.
Check out the other pop up cards too. We did 3 in the class last Friday. This is only one of them.