To make the box, refer to my Simple Box Instructions. For this 4" x 4" x 4" box I used one 12" x 12" sheet of card stock scored at 4" from each edge; for the lid I used 1/4 sheet of 12" x 12" Designer Series Paper (6" x 6"), scored at 15/16" from each edge. This makes a lid that's slightly larger than the box so it fits snugly onto the top.
To attach the flower, close the brad prongs at the bottom of the flower and insert them into the center of the box top (to find the center, draw an "X" from corner to corner on the inside of the lid); open the prongs on the inside of the box. Wrap Seam Binding Ribbon around the brad between the lid and the flower and tie a loose bow. The tag was made with the Lots of Tags Sizzlits Die and stamped with the "Thanks" image from the Rue Des Fleurs stamp set (2012 Occasions Mini Catalog, available through April 30, 2012).
This is a great way to use up your old 12" x 12" card stock and DSP.