Placemat: Two coordinating pieces of scrapbook paper cut and taped together for contrast. Make two slits for silverware, circle punch the words "Happy Easter" printed from your computer and double stick that on with a taped cotton ball on top. Voila.
Centerpiece: Fill a cylinder vase full of plastic eggs to match your papers. Next, use double stick tape around the upper rim of the vase and affix a ring of cottonballs all around the top. The rest is simply cotton balls piled on top and formed into a dome shape with another of your circles and Peep on top. Does it get easier? I think not.