Prepare cereal treats and press into square pan; unmold. Using knife, cut one 2 x 2 in. square and one 1 x 2 in. square; stack together to form a 2 x 3 in. high treat. Using melted white candy in cut parchment bag, pipe lines to form 1/2 in. wide bricks. Pipe candy snow on top, letting excess candy drip down sides.