The house on the right is made of the purple door piece, the three pieces that make up the smily face (they are blue, red and yellow), the two small triangles left over, the pink slanted piece, the big blue triangle, and the yellow window piece.
Each of the houses has a roof, door, window, and 2/3 pieces that join together to make a shape or face between them.
The house on the left is made of the small square door (green), the rectangle window piece positioned vertically (green), the two pieces that make up a red triangle picture (they are a square and a triangle) and the large orange piece.
The house in the middle is made of the white door with the diagonal cut out, the two small square pieces, the blue window piece with the diagonal cut out, the light blue triangle and two of the other triangle pieces (the light blue one is the only one that faces a different way to the others), the large grey piece, and the two pieces that make up the square picture (its a black piece with a diagonal cut out and a green triangle).