Prepare each cakes mix according to package directions, baking each in a greased and floured 9x13-inch baking pan. When cool, remove cakes from pans, wrap well in foil, and freeze. When ready to assemble, prepare mocha butter cream frosting as follows: In a large mixing bowl, beat cream cheese and butter with an electric mixer on high speed until smooth and well blended, 2-3 minutes. Add cocoa and coffee powder; beat well. With mixer on medium, gradually add powdered sugar and when incorporated, turn mixer to high and beat until light and fluffy. To assemble cakes, place one frozen cake on a large rectangular platter or tray. Cover with raspberry jam. Top with a second cake layer and cover with orange marmalade. Place remaining cake on top. Frost top and sides with mocha butter cream. Refrigerate until ready to serve. Decorate top with fresh (nontoxic) flowers, chocolate-dipped strawberries, colored sprinkles, or piping.