Edible Plate Mats ..

Very Interesting ! .. i loved this very clever way to bring out any type of finger food served at a party, by simply placing a layer of contrasting color that's made out of  herbs or spices.

   Brighten up passed hors d'oeuvres with a lively backdrop: ingredients that match the flavors of the tiny treats resting on them. A layer of chives cushions bite-size red potatoes with sour cream and caviar (left); crackly coarse salt does the same for mini radish and feta pitas (right). To make the cucumber basketweave pattern beneath our salmon-mousse cucumber cups (top), use a vegetable peeler to cut long strips from cucumbers. Weave rows and columns of strips in an over-under pattern; once finished, trim to fit the desired platter and place so the cut surfaces of the peeled strips face upward. 

Gray Platter, Mud Australia at ABC Carpet and Home. White Rectangular Platter, Pearl River Mart.

Recipes
Salmon-Mousse Cucumber Cups
Radish and Feta on Mini Pitas
Red Potatoes with Sour Cream and Caviar

Source:

http://www.marthastewartweddings.com/227253/plate-mats