With sharp knife, carefully score one pan of dough by cutting crosswise into three 10x5-inch rectangles.* Two will form roof pieces. Cut remaining rectangle in half crosswise and lengthwise; cut each small rectangle in half diagonally to form 8 triangular tree pieces. Score remaining pan of dough by cutting in half lengthwise. With toothpicks, mark three 5-inch intervals on one 15-inch edge of dough and on 15-inch lengthwise cut line. Cut dough from 5-inch mark on right of dough edge to 5-inch mark on left of cut line and vice versa to form X. Remove toothpicks. Cut pan of dough in half crosswise, cutting through center of X formed by last cut to form two 7 1/2x5-inch rectangular side pieces and 4 triangular tree pieces. The two 5-sided shapes will form end pieces.