Never Ending Square Die or continue reading for my experience.
First off, you begin with a half sheet of regular copier paper. This is going to be folded a lot and thicker paper such as card stock isn't going to be as pliable. I began with white paper. If you are a card maker, you will recognize the size and fold of a basic A2 card.
After running it through my die cutter (Big Shot), and creasing on the folds, this is the shape I had:
The cat with Knit Happens and the dog with Hello Friend are both stamps from Taylored Expressions (cat: Grouchy Grumplings TEMD44 and dog: If Dogs Could Talk TEMD40). The ball of yarn and Just Unwind are from Avery Elle, Made with Love ST-14-35. The gumball and Bless Chew are from Stamps of Life, Bubble Gum 4 Me.
Coloring was done with Prismacolor pencils. The glass part of the gum ball has a clear Gelly Roll pen layer over it for a bit of sheen and both black and clear Wink of Stella pens on the black and red parts for a bit of interest.