Start by sketching the flower and create a stylized flower. Keep adding more arcs for this particular pattern, all of the arcs should be roughly the same size.
After you have finished drawing the blossom, sketch the stem and leaves. It should look something like the image below.
Using the craft knife, follow the lines you have made and cut the little arcs. Just run the knife directly over the lines. You do not need to do anything else. Next, use the precision knife to cut out the stem and leaves. You need to make sure that you actually remove the entire shape of the leaves and the stem.
With your fingers, carefully push up on all the little tabs you have created by cutting the arcs. This will pull them up three-dimensionally from the surface of the page, creating the shapes of the petals.
Wrap the page around the jar and secured it with some tape. You can now put a LED light inside the jar and watch it glow.