"We served this at our family get-together, they LOVED it! We found that the longer you leave it in the fridge the creamier and more delicious it gets (unless you leave it in too long!). Garnish with chocolate curls and maraschino cherries!"
Prepare cakes according to package directions and bake in 9x13 inch pans. Cool completely. Cut into cubes.
Place devil's food cubes in the bottom of a glass serving dish. Fold pecans into whipped topping. Spread half of topping over devil's food cubes. Top with white cake cubes and spread remaining topping on top. Chill until serving.