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Here's a romantic centerpiece that takes no table space: a carnation mobile with matching floral napkin rings. 

Centerpiece How-To
1. Snip about 5 dozen of the inexpensive blooms at the base. 

2. Single-thread an upholstery needle with waxed twine, and pull it through the flower from the top to the base; knot the end. Repeat, leaving space between carnations (you don't have to knot the twine again). Make 8 carnation ropes of different lengths. .......

Read more at  -  http://www.marthastewart.com/goodthings/carnation-mobile-centerpiece-and-napkin-ring?xsc=eml_crd_2010_02_08