I have been using this daisy background graphic for about six months for all occasion cards. I make the daisies while watching TV or when I am in a mood to quill. I like to use the 1/16" English paper strips I buy from Whimsiquills .. the strips are actually more narrow than the American 1/16" paper.
I embellished this with several shades of brown chalk, set it with a fixative and glued it on the card. The center tight roll is slightly convex. I covered the quilled daisy with two layers of tissue paper and mailed in a regular envelope, no bubble packaging.
TIP: If you make up a stack of all occasion cards ahead of time and use quilled motifs on your cards, try using 1/16" paper strips and mail one to yourself, first, to test how it turns out in regular mail.