Once you have all six flowers on the needle, pull through and pull both ends of the thread tight and tie a double knot.
When you pull the two ends of the thread together a ball will form. You may need to adjust the pedals a little bit and spread them out to make a full flower. Once Wed post suggests sewing the pedals together, but I didn't and it turned out fine.
The tissue paper wasn't big enough to cover the box, so I staggered the paper about a half inch apart and taped it between layers so the tape didn't show. Attach the flower with thread, tape, glue, or however else you like, and voila! A cute package without spending any money. Just fabric scraps and leftover tissue paper.