Because the rolled coils are random sizes, there's no need to stress over them being exact. The card itself is a simple gate fold, meaning the short sides of a cardstock rectangle are folded in to meet at the center. The red, elongated triangle is glued to the left side only, so the flaps can be opened to reveal a greeting.
Quilled loose coils make nifty little ornaments. Roll a narrow strip of lightweight green/red paper, 1/8 inch wide, anywhere from two to seven inches in length, on a quilling tool or even a toothpick. Glue the end (a torn end blends in best), spread a little glue on the back of the coil, and randomly trim the tree. Tweezers are a huge help in handling quilling coils. To give the ornaments a bit of shine, dab one side in a metallic ink pad before gluing the opposite side to the card, or use specialty quilling paper with a gilded edge.
Make the tree trunk by rolling a loose coil and pinching it at two opposite points... this is a marquise shape. Rotate the marquise slightly and pinch again at two more points to create a rectangle.
I punched the gold metallic stars with a Fiskars three-way snowflake corner punch and used a Uniball gold gel pen for the lettering.
Quilling and paper craft supplies I recommend can be found in my Amazon shop.